10 AUGUSTA ÅRNBÄCK-CHRISTIE-LINDE. NORTHERN AND ARCTIC INVERTEBRATES. 



a. Few endocarps on the body wall. 



Dorsal tubercle placed by the side of the dorsal ganglion. The 

 opening is meniscoid, the concavity directed to the left. Only two 

 endocarps on the body-wall. Gonads three on the left side, five 

 on the right. Stomach short, horizontally placed, with longitudinal 

 folds. The surface of the test provided with spines of soft consistence. 

 Test covered with gravel and fragments of shells. One rootlike, 

 elongated process from the ventral side. 



C. mollisvina n. sp. Pl. 2, figs. 23—26. Text-figs. 1 — 2. 



b. Numerous endocarps on the body-wall. 



1. Gonads elongated, four on the left side, five or six on the right. 

 Test incrusted with fine sand grains. Several root-like processes, 

 generally short, from the ventral side. 



C. rhizopus Redikorzew 1907. Pl. 1, figs. 18 — 21. 



Pl. 2, fig. 22. Text-fig. 3. 



a. Stomach elongated and bent forming an angle . . . forma typica. 



b. Stomach short, horizontally placed var. murmanensis. 



2. Gonads short, polycarp-like, two or three on the left side, some- 

 times four in which case one or two are rudimentary, three on 

 the right. Stomach straight, short. Test incrusted with fine 

 sand grains. Usually only one root-like processus from the 

 ventral surface. C. cirrata n. sp. Pl. 2, figs. 27 — 32. 



Polycarpa Heller 1877. 



I. Opening of the dorsal tubercle directed to the left, horse-shoe-shaped. 



Stomach short and well marked off from the intestine. Apertures near 



together on high conical siphons. Test covered with root-like processes 



with very long hairs to which sand grains adhere. Only the part of the 



dorsal surface which bears the siphons is free. Form of body globular 



or elliptical. 



A. The upper horn of the opening of the dorsal tubercle incurved. In- 



termediate vessels three to eight. 



P. libera Kiaer 1893. * Pl. 2, fig. 33. 



15. The horns of the opening of the dorsal tubercle not incurved. Intermediate vessels one to 

 two. P. pusilla Herdman 1884. 



II. Opening of the dorsal tubercle directed to the right, horse-shoe-shaped, the 

 upper horn coiled up. Stomach elongated, not distinctly marked off from 

 the intestine. Apertures apart, on prominent siphons. Test rugose, with 



1 Comparing the descriptions of the different species of Polycarpa it seems most probable that the four 

 names P. comata Ålder, P. libera Kiaer, P. pusilla Herdman, P. fibrosa Stimpson represent one and the same 

 species. If this will be verified, the name of the species must be P. fibrosa. As far as I can see the name 

 fibrosa bas priority having been used by Stimpson 1852. 



