188 PART II. SYSTEMATIC ACCOUNT 



nearly meet. They lie on a cutaneous fold (Fig. 91 A, B), and the dorsal ends 

 are almost the same thickness as the rest. No perceptible glandular formation 

 whatever is to be found behind the bridle. The hind edge of the mesosoma is 

 straight except for hardly noticeable notches on the dorsal and ventral sides. 

 The ventral surface of the protosoma and mesosoma is marked by a weak 

 median furrow. 



The metameric part of the preannular section of the metasoma is roughly 

 twice as long as the anterior division of the body (Fig. 98 A). The transversely 

 oval papillae are arranged in a regular double row, bounding the ventral 

 sulcus rather tightly and pressed more or less closely together (Fig. 91 A). In 

 one particular specimen examined there were about 45 pairs. A single 

 pyriform gland with a prominent duct can be seen by transparency in each 

 papilla. Farther back the papillae increase noticeably in size and become 

 irregularly placed. The wide dorsal ciliated band begins at the front end of 

 the mesosoma and is expanded slightly at its origin. The external morphology 

 of the nonmetameric part of the preannular region remains unknown. 

 Jagersten described and figured the toothed platelets of the girdles and to 

 judge by his drawings (Jagersten, 1956, Fig. 1A) they are arranged in a single 

 row. He states that they are brownish in colour and measure about 13;u, long, 

 with the anterior group of teeth weakly developed. The material placed at 

 my disposal, however, has enabled me to extend Jagersten's observations. 

 I was able to observe the girdles in two individuals, in each of which there 

 were three girdles, the front two close together at a considerable distance 

 from the hindmost. The toothed platelets were pale yellow in colour, some- 

 what curved (Fig. 97C) and 12-16/x long. The area occupied by the anterior 

 group of teeth was about a third of the entire platelet. 



In three individuals, furthermore, it was possible to observe the post- 

 annular region. The small, transversely elongated, spatulate dorsal shields 

 each contained a pair of pyriform glands, with prominent pores around 

 which were arranged, in two rosettes, a few large epidermal gland cells 

 (Fig. 91E). A large conical papilla, lacking any visible cuticular thickening, 

 lay opposite each shield on the ventral side (Fig. 91 F). [There may be two or 

 even three - E.C.S.] 



The dimensions of the various parts of the body (on the basis of four 

 individuals) are as follows: length of tentacle, 7-8 mm; length of anterior 

 division of the body (protosoma + mesosoma), 0-75-1.05 mm; length of 

 preannular region of the metasoma, 17-45 mm; length of the whole body, 

 41-93 mm. 



The membrane of the spindle-shaped spermatophores is distinguished by 



