298 PART II. SYSTEMATIC ACCOUNT 



trunk — has a dorsal ciliated band and a narrow ventral sulcus (Fig. HH 133 A, 

 B). The adhesive papillae here are round and small, though often they be- 

 come pressed together and correspondingly change their shape. They are 

 arranged in rather regular rows on either side of the ventral sulcus and 

 have no plaques. I have counted these 'metameric' papillae in seven specimens 

 and found them to vary between 36 and 45 pairs. There is a single pyriform 

 gland in each one. Attentive examination of the surface of the papilla reveals 

 a small pore — the aperture of the canal of the pyriform gland — surrounded 

 by a halo of epidermal gland cells which contain a small-grained secretion 

 (Fig. JJ133C). 



The nonmetameric region of the preannular section is several times longer 

 than the metameric region. It bears small scattered contracted papillae which 

 in places may be wart-like, and also large longitudinal (along the dorsal side ?) 

 bands of glandular epidermis, consisting of big flat cells with a granular 

 secretion. 



There are three girdles, the front two lying close together and the hindmost 

 0-7-2-2 mm behind. Each girdle is formed of a protuberant ridge bearing 

 a single row of toothed platelets. The anterior girdle has a broad gap 

 on the dorsal side, the second on the ventral and the third a narrow gap 

 on both sides of the body. A small median papilla is found behind the 

 last girdle, bearing on its tip a distinct crescent-shaped cuticular plaque 

 (Fig. JJ133Z)). 



The yellowish toothed platelets are elongated and have a rather distinct, if 

 slight, constriction in the middle (Fig. JJ133£, F). The two groups of teeth — 

 anterior and posterior — are equally developed. The platelets are mostly 

 1 5— 22ft long, but sometimes smaller ones may be encountered 12 or 14/x long. 



The postannular section starts with a clearly defined constriction (Fig. 

 JJ133D). Its small conical ventral papillae, arranged at regular intervals, bear 

 colourless plaques on their tips. There are no dorsal shields, but instead only 

 a small glandular patch of epidermis opposite each ventral papilla. 



Measurement of 1 1 specimens gave the following results (mm) : 



Length of tentacle up to 1 1 



(Length of tentacle when contracted 5 or 4) 



Length of the fore-part of the body 0-7-1-57 



Breadth of mesosoma • 2-0 • 2 5 



Length of preannular section 12-20 



Length of postannular section up to 25 



Spermatophores, 300-3 80/x long, were found in the spermducts of three 



