ANNELIDA. 
549 
Tribe II, Enchytiijeina. 
Blood generally red ; no pores on the dorsal line. PachydriluSj Olaparede. 
Blood colourless j a pore on each segment of the dorsal line. 
Enchytrceus^ Ilenle. 
Family II, NAIDEA. 
Tribe I. Naidea propria. 
Dorsal set® from the fifth to the thirteenth ring, ciipuliform at extremity. 
J{cteroch<T.ta, Olaparede. 
Forked sot® at all the bundles, more or less at the ventral bundles. - 
Caudal prolongation simple. 
Pair of penes, sharp, long, non-retractile . . Stylodrihis^ Olaparede. 
• No distinct penis. 
Vascular lacun® with contractile c®ca. . Lumhricidus, Grube. 
Vascular lacun®, no contractile c®ca. 
All the set® forked Clitellio, Savigny. 
Ilair-like set® on the upper bundles. 
Vascular lacun® dilating and contracting as far as the 8th 
ring or less T'uhifex, Lamarck. 
No contractile vascular lacun® ... . Ah/s, Muller. 
Caudal prolongation terminating by finger-like projections. 
These numerous Dero, Oken. 
Two in number Aidophorus, Schmarda. 
Set® all hair-like. 
Digestive tube free, cylindrical, straight. . . . MesopachySj Oersted. 
Digestive tube presenting dilatations, or spiral. 
Molosomaj Ilemprich et 
Ehren, 
Tribe II. Chjetogastrina. 
Set® simply forked Chcetogaster^ Baer. 
Set® presenting laterally at their extremities prolongations into comb-like 
teeth Ctenodrilus, Claparede. 
Perichoita posthuma^ sp, n., Vaillant, 1. c. p. 228, pi. 10. fig. 1-8, Java. 
Pkchytrmis vermictdaris, Ilenle. Ratzel, 1. c., gives a short account of the 
pharyngeal nervous system of this species ; also of the development of the 
receptacula seminis, and of the structure of the salivary glands. The mus- 
cular tissue is described as transversely striated. This is a first essay by a 
pupil of Prof. Pagenstecher. 
pMchytrcms pagenstecheri, sp. n., Ratzel, 1. c. p. 587, Taf. 42. fig. 21, on 
water-plants, Rhine, at Carlsruhe, and Tumpeln, Heidelberg. 
Limnodrilus claparedianus^ Ratzel, 1. c. p. 690, Taf. 42. fig. 24, Carlsruhe. 
LnmhricKS agricola, Hoff. Ratzel and Warschawsky, /. c,, give an account 
of the development of this species. 
