ENCHYTRyEID^ 



21 



posterior to clitellum, with chloragogen glands. Spcrmathccae without 

 diverticles, opening into the intestine. Sperm-ducts three or four 

 times as long as the funnels, which are sigmoid. No atrial and no 

 accessory glands. One set of penial glands confined to pcnial bulb. 

 A pair of long sperm sacs 



and an ovisac. Ncph- >"' v. / 



ridia large, plurilobed. ' ^ ^ ^ ^"^^ ° 



Lymphocytes of medium 

 size, eosinophile ellipso- 

 idal. Color of formalin 

 specimen white. 



Locality. — Unalaska, 

 Aug. lo, 1S99. Collected 

 by Prof. W. A. Setchell. 

 Found under moss. 



Characteristics . — One 

 of the smallest species 

 investigated. Specimens 

 found in August not fully 

 developed, clitellum want- 

 ing. No atrial glands 

 could be seen, and no ac- 

 cessory glands. Lymph- 

 ocytes extremely charac- 

 teristic, being strongly 

 eosinophilous, with red 

 granules surrounded by a 

 pellucid, uncolored zone. 

 Cells in the tissue too 

 small to allow of a more 

 detailed description. 



Fig. I. Mesenchytrceus unalaskce. 



MESENCHYTIMEUS ASIATICUS sp. nov. 

 pi. XI, fig. 4; and text-figs. 2 and 3. 

 Definition. — Length about 14 mm., width i mm. or .9 mm. 

 (contracted specimens). Somites 54. Setae: laterals, 2, 2, 2, 2, 2, 

 2, 2, 2, 3, 3, 2, 3, 3, 2, 2, etc. ; ventrals, 4, 4, 4, 4, 4, 5, 4, 6, 5, 5, 

 o, 4, 4, 4, 3, 3, etc. Prostomium not much pointed, with head-pore 

 half way between apex and somite I. Clitellum prominent, IX to 

 XIIL Sexual papillae quite prominent. Brain posteriorly more or 

 less deeply emarginated. Dorsal vessel rises behind clitellum. Sper- 



