238 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



The calciferous diverticles are arranged three on each 

 side. The two anterior pairs contain lime crystals. The 

 po-sterior pair is of a different structure, the inner lining 

 consisting of globular cells like those figured from Benhamia 

 nana. In this posterior pair there are no lime crystals. 

 Each diverticle opens into the intestine by a separate pore, 

 and they bear no relation to each other. There is no typh- 

 losole and there are no intestinal coeca. 



The nefhridia resemble in a general way those of the 

 genus Benhamia. There are ten rows of micronephridia 

 on either side of the ventral ganglion. The pair nearest 

 the ganglion is split up into three small lobes, and the one 

 nearest this consists of two lobes, but all the others consist of 

 but a single lobe. Each lobe is surrounded by a coelomic 

 glandular mantle. No nephrostomes were observed. There 

 is no specialized zone of sense-organs in the epidermis. 



Dichogaster Townsendi, sp. nov. 



Plate XIV, Fig. 182. 



Definition. — Length 90 mm., width 5 mm. Somites about 165. Prosto- 

 mium divides somite I about one-half. Dorsal pores present. Genital zone, 

 a flat, square field on the ventral side of XVI-XIX (immature specimen). 

 Setse paired, absent on somites XVI and XVII. No specialized penial setae. 

 Spermathecae two pairs, in VIII and IX; pores postseptal; a medium sized 

 diverticle pointing forwards. Testes, two pairs in X and XI. Sperm-funnels 

 in X and XL Sperm-sacs racemose, in XI and XII, both postseptal. Three 

 pairs of prostates. Anterior prostates opening with the sperm-ducts into 

 XVII, one pair in XVIII and one pair in XIX. Two gizzards in V and VI. 

 Diverticles of the intestine in XV, XVI, XVII. Sacculated intestine com- 

 mences in XIX. Last hearts in XII. Nephridia: anteriorly plectonephridia, 

 posteriorly meganephridia. No subpharyngeal glands and no septal glands. 

 Color, above brownish and pigmented, below pale, uncolored. 



Septal formula: — 



V/VI, VI/VII, VII/VIII, VIII/IX, IX/X, X/X!, XI/XII, XII/XIII, 



XIII/XIV, XIV/XV, XV/XVI. 



Habitat. — Jamaica. Collected by Professor C. H. Tyler- 

 Townsend, for whom the species is named. 



