160 bulletin: museum of comparative zoology. 



there are two pairs of lateral rostral spines, one of which lies in advance of the 

 eyes, the other just behind the posterior wall of the orbit ; on the lower face 

 of the rostrum there appears just the slightest trace of a median longitudinal 

 carina. The upper surface of the first or dorsal pair of carinse is eroded ; be- 

 hind the cervical groove this pair of carinse converge towards one another. Just 

 iii front of this pair of carinse, lying in the median line at the base of the ros- 

 trum, is a small tubercle or papilla. In the interval between the first and second 

 carinse on each side are about four faint tubercles on the cardiac region, and on 

 each side of the gastric region are four larger low tubercles, the hindmost of 

 which is the largest of all. The anterior moiety of the third carina (adopting 

 Wood-Mason's terminology) is well developed as a backward prolongation 

 of the external orbital spine, which is long, acute, and inclined outward and 

 upward. The fourth carina is also developed both anteriorly and posteriorly 

 to the cervical groove, its anterior moiety being continuous with the antero- 

 inferior, or branchiostegian, spine of the carapace. Barring the external orbital 

 and branchiostegian spines, the anterior moieties of both the third and fourth 

 carinse are entire, without a trace of spine or tooth. The trend of the branchi- 

 ostegian spine is nearly straight forward, its downward and outward deflection 

 being very slight. With the exceptions noted above, the spaces between the 

 carinse of the carapace are pretty smooth. 



The abdomen is lightly sculptured for the genus to which this species be- 

 longs. Only the first and sixth segments are conspicuously carinated above. 

 The pleurse of the second abdominal segment are one-toothed. The telson 

 exceeds the last pair of abdominal appendages, and is rather abruptly bent 

 upward at the tip. 



Length, 75 mm. ; cephalothorax including rostrum, 35 mm. ; rostrum, 19 mm. ; 

 telson, 13 mm. 



Station 261, off Grenada. 340 fathoms. 1 9 with eggs. Type. 

 153, off Montserrat. 303 " I $. 



" 260, off Grenada. 291 " 1 young. 



This species is peculiar in having the anterior moiety of the third and fourth 

 carinse of the carapace well developed and continuous with the external orbital 

 and branchiostegian spines respectively. In G. gilesii Wood-Mason, which 

 also has the anterior portion of both the third and fourth crests developed, 

 these crests are produced anteriorly into small spines independent of the 

 external orbital and branchiostegian spines. 



Stylodactylus serratus A. M. Edw. 



Station 205. 334 fathoms. 3 specimens. 

 " 151. 356 " 1 



Pantomus parvulus A. M. Edw. 



Station 134 248 fathoms. 2 specimens. 



