Bulletin - New York State Museum Year: 1887 (1880s) Authors: New York State Museum New York State Museum Subjects: Science Publisher: Albany : New York State Education Dept Contributing Library: Smithsonian Institution Libraries Digitizing Sponsor: Biodiv

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Identifier: bulletinnewyork911905newy Title: Bulletin - New York State Museum Year: 1887 (1880s) Authors: New York State Museum New York State Museum Subjects: Science Publisher: Albany : New York State Education Dept Contributing Library: Smithsonian Institution Libraries Digitizing Sponsor: Biodiversity Heritage Library
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Text Appearing Before Image: wn crayfish and is the only species of thegenus so far found in New York city, so that it is unnecessary to give any description of it.The genus is moreover a veryperplexing one, and any onemaking a study of it shouldconsult the works of Hagenand Faxon mentioned above.Crayfishes are found understones in the beds of smallbrooks or in springs, wherethey lie with their heads andantennae out, waiting for asmall fish or a worm andready to spring back at anysign of danger. In largerbrooks with muddy banksthey make burrows and areindeed a considerable nuisancein canals, as they underminethe sides, sometimes causing disastrous cave ins. They either walk slowly along the bottoms on the tips of theirlegs, with the large chelae held straight out in front, or propel them-selves backward through the water in a series of leaps, by the bend-ing of the abdomen with its fanlike fin. The eggs are large, and the young* do not undergo any meta-morphosis, being hatched in a form very similar to the adult. Text Appearing After Image: Fig-. 6 Cambarus bartonii llir.IIER CRUSTACEA OF NEW YORK C:i lA 135 3 THALASSINIDEA Moderate sized forms with two longitudinal dorsal sutures andwith a cervical suture frequently present. First thoracic legs usuallylarge and chelate. Abdomen large. Burrowing forms. Representatives of this group have not so far been taken withinthe city limits, but species of the genera Callianassa and Gebia maypossibly be found. They inhabit deep burrows in the mud or muddy ^^^- 4 ANOMURA Aberrant forms, at one time placed in a class by themselves butnow united with the Macrura. Its principal diagnostic character isthe reduction of the last pair of thoracic legs and their dorsal posi-tion. It includes the family Hippidae, the sand-bugs, and thePaguridae, the hermit crabs. Family hifFidae: Hippa talpoida Say Saiid-bng Hippa talpoida Say, T. Acad. Nat. Sci. Phila. Jour. 1817. 1:160.DeKay. /. c. 1844. p.i8, pi.7, fig.i/. Verrill. /. c. 1874. p.548, pi.2, fig.5. An oval and very convex form,wdth numerous
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