128 IJr. F. E. Beddard on the 



segments in their greater size. The posterior setae have tlie 

 same irregular quincuncial arrangement which occurs in 

 Pontoscolcx coretliruriis ] many of them are large; they vary 

 in fact in size, but are never ornamented. 



Willi regard to internal structure this species shows certain 

 differences from Pontoscolex corethrnrus ; but they are not, in 

 my opinion, sufficient to separate the two forms generically. 

 ^J'he material was not in a sufficiently good state of preserva- 

 tion to allow of anything like a complete account of even the 

 macroscopic anatomy, and I did not think it worth while lo 

 attempt any section cutting. 



Thealinientary canal presents the same characters originally 

 described by Porrier* in Pontoscolex [Urochfeta) corethrurus. 

 The large gizzard is situated anteriorly, though I have not 

 been able to fix precisely the segment or segments which it 

 occupies. On each side of the gizzard is a large coiled 

 " glande a mucosites." Schmarda has mentioned the fact that 

 the cesojihagus is furnished with " 4 braune birnformige 

 Organc," which I take to be the calciferous glands or " glands 

 of ]\lorrcn " as they are sometimes called. I count, however, 

 six of them, i. e. three pairs, as in Pontoscolex corethrurus. 



Behind the gizzard are four stout mesenteries. 



Behind these again lie two pairs of liearts. 



Of the genital organs only the spermathecas and the sperm- 

 sacs were visible. I only found two pairs of spermathecaj, 

 which lie behind the gizzard in the segment bounded by the 

 two last thick mesenteries. Their form (see fig. 6) is rather 

 different from that of the spermathecai in Pontoscolex core- 

 thrurus. Each consists of a reniform pouch connected with 

 a long duct which leads to tiie exterior. The sperm-sacs are 

 tongue-sliaped organs, as in Pontoscolex corethrurus. 



In the posterior region of the body the " pyriform vesicles " 

 characteristic of Pontoscolex were present. 



(8) Diachjeta littoralis, sp. n. 

 (PI. Vll. Hgs. 4 and 5.) 



Fonfoficolea- aremcola, Schmarda, Neue •wirbell. Thiere, Bd. i. Halfte ii. 



p. 11 (in pai-t). 

 Pontoscolex arenicoh, "N'aillant, Annel4s, p. 198 (in part). 



This worm, like Diachata Thomasiif, has eight setre 

 in each segment, which alternate in position upon successive 

 segments from the very first ; and, as in that species, the setas 



* " litudos sur rorr^anisation dcs Lombriciens torrestres, Anatoniie 

 des Uroducta^' Arch. Zool. Exp. t. iii. (1874) p. 331. 



t Benliani, " Studies on Eartlnvorms, No. II.," Quart. Journ. Micr. Sci. 

 vol. xxvii. p. 80. 



