I50 



NEW YORK STATE MUSEUM 



serrated dactylus folding- back on the 

 propodiis like a knife blade. The tail 

 fin is large and armed with spines, 

 which can give a severe dig if the 

 animal is handled incautiously. 



It inhabits burrows of its own con- 

 struction, 15-20 mm in diameter, in 

 the soft mud in shallow water. 



Length i5-25cm. Color yellowish 

 with green, brown and yellow mark- 

 ings. 



Taken at Cold Spring Harbor and 

 may be found within the city limits. 



Order 5 CUIMACE-A. 



A small order of Malacostraca, in 

 which the anterior part of the body is 

 /. V r|, j. I very much larger than the posterior. 



^0 W ^'^V - A carapace is present, covering the 



Fig. 17 squiua empusa anterior scsfments and leaving- never 



(After Rathbun) ^ ^ 



more than five segments exposed. 



Abdomen cylindric, flexible, of six segments, the fifth longest. 



The members of this order are bottom forms, extending to very 



great depths and reaching their greatest development in colder 



Fig-. 18 Diastylus quad r is p inosa Sars (After Verrill) 



waters. None have been taken so far in New York city, but several 

 species will probably be obtained by dredging. 



The species of Diastylus figured is common, according to- Verrill, 

 on soft muddy bottoms in Vineyard sound. 



