THE CRUSTACEA OF NEW JERvSEY. 165 



Mouth with teeth and fine hairs on labriim sometimes obscure, 

 sometimes plain, and close outside bottom of medial notch 

 small hard prominence. Palps broad, on basal exterior edges 

 short row of spines, not equal in length to width of palps. 

 Mandibles with five main teeth, second and third show only 

 an obscure rudiment of being double. Between these two teeth, 

 and between third and fourth tooth, a small intermediate tooth. 

 Inferior angle narrow, rounded, spinose. End of apodcme of 

 maxillae expanded. Pedicel of first cirrus extremely broad, and 

 rami set in an unusually crooked manner. Basal segment of 

 shorter and broader ramus of this cirrus with dorsal surface 

 produced into plate fringed with very fine hairs. Height two 

 inches, diameter two and one-half inches. (Darwin. ) 



Remarks. — Known from the Atlantic Ocean, Arctic seas and 

 Gulf Stream. It is found attached to whales, and included here 

 as De Kay records it from whales from off Sandy Hook. 



Sub=CIass MALACOSTRACA. 



Crustacea of high organization, and usually of consideral)le 

 size. With the exception of one order the body is commonly 

 divided into a thorax of eight, and an abdomen of seven seg- 

 ments. Appendages usually highly dift'erentiated. Usually 

 mesenteron forming only small portion of adult enteric canal, 

 and gastric mill present. Renal organs as antennary glands. 

 The Nauplius stage is usually passed through in the egg, but 

 there is a more or less complex metamorphosis. 



Of the various orders included in the present assemblage, six 

 are here admitted, as the Arthrostraca, Cumacea, Phyllocarida, 

 Stomatopoda, Schizopoda and the Decapoda. 



Key to the orders. 



a. Eyes sessile : first, and also sometimes second thoracic segment, joined 

 with head and bearing maxillipeds ; remaining seven segments free and 

 bear legs. arthrostrac.v 



0(7. Eves stalked. 



