Mr. C. Spcnce Bate on the British Diastylidse. 457 



The whole animal (says Goodsir) is of a fine straw colour with 

 a delicate tinge of pink, which is brighter in certain lights. 



Cuma Edwardsii. PI. XIV. fig. iv. 

 Cuma Edicardsii, Kroyer, Voyages en Scand. 



Carapace covering only two segments of the thorax, leaving 

 the live posterior ones exposed as complete rings in themselves. 

 The carapace is marked on the lateral margins as if it were 

 divided into segments ; its anterior portion extends in front of 

 the antennal segments, the anterior inferior angle receding. 

 The lower antenna exposed considerably in advance of the cara- 

 pace. The two anterior thoracic legs succeeding the gnathopoda 

 are extremely long, the three posterior extremely short, and all ex- 

 cept the posterior furnished with a palpe or secondary appendage. 

 The segments of the thorax lie very compact, and resemble a 

 continuation of the carapace ; those of the abdomen are naked, 

 except the penultimate, which is furnished with a pair of limbs 

 common in form to the tribe. Telsun rudimentary. 



Having seen but a single specimen, for which I am indebted 

 to Professor Williamson, who obtained it from Weymouth and 

 kindly sent it to me, I am not enabled to speak so positively 

 as one could wish, but I am much inclined to believe that it 

 should represent a separate genus. All the Cuma exhibit but four 

 segments posterior to the carapace, whereas this species exposes 

 five ; it is less compressed at the sides, the anterior form of the 

 carapace is more pointed, and the antenna appears longer, but 

 the importance of these relative parts can only be distinctly 

 appreciated by dissection and a proper examination of the details. 



It is evidently the same species as the one figured in Kroyer's 

 great work, and until further opportunity occurs of examining 

 its structure, it must still be retained in the genus assigned to 

 it by its discoverer. 



EuDORAj n. g. 



Diffei's from Cuma in having the upper antenna obsolete*. 



Eudora truncatula, mihi. PI. XIV. fig. iii. 



The lateral angles of the carapace meet in front of the antennal 

 segments and are somewhat raised above them. The inferior 



* ily own inclination is to unite this genus with Cuma, and Venilia with 

 Bodotria, to which in general form they respectively agree. But Mr. Goodsir, 

 who has dissected many of the genus Cuma, distinctly affirms the upper 

 antenna to be present, whereas in Bodotria he is as positive that the 

 lower is " quite obsolete ; " — facts so distinctly at variance with my own 

 experience of the closely allied forms of Eudora and Venilia, that I am 

 rompclled, in deference to so careful an investigator, to i)lace the new 

 i>pccies in separcitc genera. 



