416 PART II. SYSTEMATIC ACCOUNT 



concentrated into a whitish band near the posterior end of the mesosoma, 

 encircling the body but most marked on the dorsal side. Just in front of this 

 line on the ventral side there is a short transverse groove and from it a 

 longitudinal groove extends back to the end of the mesosoma (Fig. G162B, 

 C,D). 



"The metameric region of the trunk (metasoma) bears sharp latero- 

 ventral ridges, separated by a deep mid-ventral groove. Small papillae, each 

 bearing a small adhesive plaque (Fig. G1627), lie along the crests of the 

 ridges, and associated with each one is a patch of glandular epidermis on the 

 outer surface of the ridge (Fig. G1622?, D). Five to ten small dark spots on 

 each patch mark the openings of internal pyriform glands. The arrangement 

 of alternate large and small patches shown in Fig. G162B and D continues 

 fairly regularly to the end of the metameric region. A ciliated band, flanked 

 at its anterior end by bands of glandular epidermis, extends all along the 

 dorsal side of the metameric region. 



"The nonmetameric part of the trunk that follows the metameric part 

 has a very regular arrangement of papillae. They lie alternately on either 

 side of a narrow mid-ventral groove at intervals of 1-3 mm (Fig. G162G). 

 Each elongated papilla covers about one-third of the circumference of the 

 body and bears a row of five to fifteen adhesive plaques 50 to 65/x in dia- 

 meter, with raised and striated anterior borders (Fig. G162G, J). These 

 papillae continue to the posterior end of each specimen and the girdles and 

 postannular regions of the trunk are missing. 



"The larger tube belongs to a female about 50 cm long and 1-33 mm in 

 diameter. The length of the fore-part of the body (protosoma plus mesosoma) 

 is 6-08 mm, of the metameric region of the metasoma 35 mm, and of the 

 tentacles 29 mm. The male is 13-5 cm long and 1-0 mm in diameter, with 

 the fore-part 4-95 mm, the metameric region 40 mm and the tentacles 

 about 20 mm long. In many pogonophores the preannular and postannular 

 regions are approximately equal in length, so the complete adult female of 

 this species may, quite possibly, be a metre long, and its tube may be 

 longer still. 



"The oviducts of the female, containing oocytes up to 150/x in diameter, 

 run throughout the trunk. The trunk of the male is similarly occupied by 

 ducts full of spermatophores. The spermatophores are flattened and leaf-like 

 as in other members of the family Polybrachiidae, but their asymmetrical 

 outline and curved superficial ridge (Fig. G162#) are entirely unknown in 

 other Pogonophora. 



"The dark-brown tubes are 34 and 50 cm long but still incomplete. The 



