320 



DISCOVERY REPORTS 

 1 58 1, 1585 and 1589 have the rostrum not constricted 



(2) Specimens from Sts 

 distally, and four spines on each side of the median spine. 



(3) One specimen from St. 1585 has the pleura of somite 2 pointed, eyes narrower, 

 and rostrum more slender ; also five spines on each side of the median telson spine. 



A young specimen, presumably of this form, has rostrum without the bare apical 

 part and the end of the telson not produced and with four spines on either side of the 

 median spine, fig. 10 d, e. It is to be supposed that the form of the telson changes 

 considerably during growth. 



Thalassinid D. XI (Fig. 20) 



Discovery St. 1576. 



Rostrum 3 mm. ; body 8-2 mm. 



Rostrum rather broad, tapering, much longer than antennule. Carapace with few 

 marginal spines. Abdomen: somite 2 with very large dorsal spine ; somites 3-5 slightly 

 ridged. Pleura all rounded. 



a. Side view. 

 d. Chela of leg i . 



Fig. 20. Thalassinid D. XI. St. 1576. 

 b. Rostrum. 

 e. Palp of maxillule. 



c. Telson. 



/. Palp of maxilla. 



