DECAPOD CRUSTACEANS OF THE BEAUFORT, N. C, REGION. 



395 



with the hand, its cutting edge with two slender teeth. Smaller chela about one-third the size of its 

 mate, somewhat compressed but otherwise similarly constructed. Third, fourth, and fifth legs with 

 short, conical dactylus. 



Telson narrow, its sides uniformly convergent to the small rounded tip, which bears four slender 

 spines; there is also a spine on each 

 margin near the middle. 



Length of body, i6 mm., cara- 

 pace, 7 mm., large claw, lo mm. 



Color, pellucid, milky white. 

 Egg masses light bluish-green. The 

 integument is so transparent that the 

 color of the internal organs is plainly 

 visible. 



Three specimens of this little 

 shrimp, 2 females and i male, were 

 obtained August i, 1914, on the fish- 

 ing banks about 20 miles off Beau- 

 fort Inlet. Another series of 8 or 10 

 specimens was collected July 20, 1915. 

 In both cases the animals were found 

 in the canals of a large sponge in com- 

 pany ■ivith Synalpheus longicarpus and 

 5. townsendi, to which they bear a 

 striking superficial resemblance. 

 When disturbed or, especially, when 

 dropped into alcohol, they are able to 

 make a snapping sound with the large 

 chela quite as loud as that made by 

 one of the true snapping shrimps. 



Fig. 13. — CoraUiocaris, wilsoni, cf X4M. 



a. Carapace, lateral view; b, telsoa and uropods; c. large chela; outer sur- 

 face; d, fingers of large chela from above; e, small chiliped; /. right leg of first 

 pair; o. antennule. 



The species has been dedicated to Dr. H. V. Wilson, of the University of North Carolina, for many 

 years an investigator at the Beatifort station, at one time its director, a well-known authority on sponges, 

 and the one to whom the imdertaking of this paper on the decapod crustaceans is largely due. 



Family GNATHOPHYLLIDAE. 



Caridea having the first two pairs of legs chelate, the first pair smaller than the 

 second, the carpus of the second pair not subdivided, the rostrum short and toothed, 

 the third article of the third maxillipeds very broad, the mandibles simple and the second 

 maxillipeds with a very short seventh article. 



The family contains but a single genus. 



Genus GNATHOPHYLLUM Latreille. 



GnathophylluTJi Latreille, 1819, p. 72; (Gnaiophyllum) ibid, 1829, p.96. 

 Drimo Risso, 1S29, p. 70. 



Gnathophyllimi modestiun Hay. PI. xxvni, fig. i. 



Gnathophyllum tnodestum Hay, 1917, p. 72. 



Body short and thick. Carapace with a low carina continuous in front with the rostrum and extend- 

 ing about halfway to the posterior margin. Rostrum reaching to distal end of basal article of antennule, 

 obliquely truncate above and with 7 teeth. Suborbital spine acute. Abdomen with the last three 

 segmen'cs abruptly smaller and strongly flexed; telson with two marginal spines at about the distal 

 third, the tip almost truncate and with 6 spines, of which the median and longest pair is about one- 



