ART. 18 SYNOPSIS OF CALANOID CEUSTACEA — MAESH 23 



setts specimens averaged: Female, 1.64 mm; male, 1.58 mm. It 

 seems probable that Lilljeborg's figure for the female is a misprint 

 for 1.9 mm. 



Ocmrrence. — The original description was from collections made 

 at St. Johns in Newfoundland. Schacht's description was from 

 Lilljeborg's material. Willey (1923) reported it from the Shuben- 

 acadie Kiver, Nova Scotia, but gave no description. Wilson col- 

 lected it in eastern Massachusetts but determined it as E. nevadensis. 

 An examination of his material deposited in the United States Na- 

 tional Museum shows that it is E. nordensMdIdi. It seems probable 

 that it will appear in other localities in New England. It was found 

 in a collection made by Dr. R. E. Coker in White Lake, N. C. ; this 

 locality is especially interesting as it indicates a possible wide distri- 

 bution of the species. 



EPISCHURA BAIKALENSIS Sars 



Plate 13, Figubes 1^ 



Epischura baikalensis Sars, 1900, p. 226, pi. 6, figs. 1-17.— Tollinger, 1911, p. 

 157, fig. P*.— Rtxov, 1930, p. 258, fig. 84, 1 and 2; fig. 85, 1 and 2. 



Female cephalic segment well defined, having dorsally a strongly 

 marked cervical depression. Last cephalothoracic segment expanded 

 on the sides in rather large rounded lobes. Abdomen (pi. 13, fig. 1) 

 of three evident segments. The spermatophore is twisted and accom- 

 panied by a hyaline curved plate. The terminal setae of the furca 

 in adult females are very short and curved. 



The abdomen of the male (pi. 13, fig. 2) is asymmetrical, and 

 the apical setae are of normal length. The abdomen is slightly bent 

 to the right. The segments are of about equal length and more 

 prominent on the right side. Only the last segment has a distinct 

 process; this is a recurved lobule placed somewhat ventrally and 

 projecting to the right. 



The first antennae reach to about the end of the furca. The exopod 

 of the second antenna is said by Sars to have five segments; his 

 figure, however, more or less clearly shows six. Evidently Sars did 

 not recognize the small terminal segment, which is characteristic 

 of other species. 



In the fifth feet of the female (pi. 13, fig. 3) the second basipod 

 is short, about as broad as long, and armed with a small spinule 

 on the external border. The first segment of the exopod has a spine 

 at the outer distal angle. The second segment terminates in 

 a short conical point and has three spines on its external border. 



The right fifth foot of the male (pi. 13, fig. 4) is 2-segmented. 

 The second basipod has a blunt projection from its inner border, 

 probably representing an endopod; the exopod is a slender curved 



