58 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Echthrogaleus torpedinis Wilson, 1907 



Figures 291-294 

 Echthrogaleus torpedinis Wilson, 1907, p. 371; 1932, p. 429. 



Specimens studied.— USNM 11350, syntypes. 3 females from 

 Torpedo occidentalis from Provincetown, Mass. 



The only material available for study were type specimens from the 

 U.S. National Museum. Because I did not dissect any of these types, 

 a complete redescription is not possible here. This will have to wait 

 until more material can be collected; nevertheless, I have figured some 

 details and have added here to the original description. 



Female. — Body form as in figure 291. Total length 12.8 mm (based 

 on a single specimen). Greatest width 8.2 mm (measured at widest 

 part of the dorsal thoracic plates). Cephalon rounded, about as wide 

 as long (6.2 by 6.2 mm). Dorsal thoracic plates on segment 4. These 

 plates very conspicvious and serrated along their posterior borders. 

 Plates extending over the proximal two-thirds of the genital segment. 

 Genital segment with its posterior corners produced to form inwardly 

 directed lobes. Abdomen 1-segmented, hidden in dorsal view. A 

 small dorsal plate with abdomen. Caudal ramus (fig. 292) bearing 6 

 naked setae on posterior border. Rami with fine spinules along inner 

 margins. 



Oral area w^ith adhesion pads reduced. Pad associated with maxU- 

 liped in form of a posteriorly directed process. Oral appendages like 

 those of E. denticulatus. 



Legs 1-4 (fig. 293) biramose with spine and setal formula as follows : 



Leg 4 lamelliform as in figure. Leg 5 (fig. 294) a process not projecting 

 beyond tip of genital segment, bearing a single stout spine and 3 setae 

 armed as in figure. Leg 6 as in E. denticalatus. 



Color in preserved specimens cream tan, devoid of heavy pigmen- 

 tation. 



Egg strings long and straight. 



Male. — Unknown. 



Discussion. — This species seems closely related to E. denticulatus, 

 but it can be separated from that species by the nature of the dorsal 

 thoracic plates of segment 4, by the relative length of leg 5, and by 

 the differences in the armature of the legs. This copepod has been 

 collected twice from Torpedo occidentalis off the coast of Massachu- 

 setts, Further collecting would be necessary before concluding that 



