DESCRIPTIONS OF GENERA AND SPECIES 339 



(4) Enchytraeus adriaticus, VEJDOVSKY. 



E. adriaticus, VEJDOVSKY, SB. Bb'hm. Ges., 1877, p. 302. 



E. adriaticus (forma jaltensis), CzEKNiAVSKY, Bull. Soc. Nat. Mosc., 1880, p. 322. 



Definition. Length, ~i$mm.; number of segments, 2$; setae, 3 per bundle. Brain convex 

 posteriorly. Anteseptal part of nephridium hardly narrower than postseptal, with coiled 

 lumen. Spermatheca with short duct covered by three rows of glandular cells. Hab. 

 Austro-lllyrian coast-line ; Jalta. 



(5) Enchytraeus monochaetus, MICHAELSEN. 

 E. monochaetus, MICHAELSEN, JB. wiss. Anst. Hamb. 1888, p. 66. 



Definition. Length, 7 mm.; setae in four rows of a single seta each; setae usually wanting 

 upon the first four or five segments, lateral setae wanting upon a few segments after. No 

 salivary glands. Brain deeply cleft behind. Nephridia bent at right angles, anteseptal part 

 not much more than funnel, duct not sharply marked off. Spermathecae with a long duct as 

 long as, and sharply distinguished from, the pear-shaped pouch, a few glands at base. 

 Hab. South Georgia, sea-shore. 



This species is most remarkable for the ' cephalization,' met with in no other 

 Enchytraeid. MICHAELSEN states that the cuticle is unusually thick. In the buccal 

 cavity is a taste-papilla. Besides the other characters mentioned in the above 

 definition, the species has one pair of small septal glands in the fourth segment, 

 two pairs of larger glands in the fifth segment, and three pairs of very large ones 

 in the sixth segment ; the sperm-duct funnel is short. 



(6) Enchytraeus arenarius, MICHAELSEN. 

 E. arenarius, MICHAELSEN, ibid. 1889, p. 12. 



Definition. Length, 10 mm.; setae, 3 per bundle. Brain deeply cleft behind. Anteseptal part 

 of nephridia little more than funnel, duct arises near to septum as in Mesenchytraeus. 

 Spermathecae cylindrical with no distinction between pouch and duct, external pore with 

 glandular cells. Hab. Germany (Elbe shore). 



MICHAELSEN describes as a remarkable character of this species the form of 

 the perivisceral corpuscles; these are furnished along one side with numerous 

 pointed processes. The blood, moreover, is yellow the present species being the 

 only one of the genus which shows this Pachydrilus-like character, if we except 



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