8 
THE VOYAGE OF H.M.S. CHALLENGER. 
are three lips with accessory lips without dentigerous ridges ; the accessory lips have 
two-thirds of the dimensions of the principal lips. The upper lip is oval with truncated 
base; it has a breadth of 0'26 mm. and a length of 0'29 mm., the base of 0T8 mm., 
the pulp has on the outside two rounded processes, to the outer sides of which are placed 
two large papillae ; the inside of the lip shows two reniform protrusions, surmounting the 
lip anteriorly. Two slightly prominent nuchal papillae are situated 1'5 mm. from the 
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Fig. 1. — Cephalic end of Ascaris rnacruroidei, n. sp., from the dorsal surface ; u.l., upper lip ; p., papilla ; a. 1., accessory lip. 
anterior end, their stalks piercing the cuticle. The oesophagus has a length of 5 '5 mm., 
and the tail has a length of 0‘68 mm. and is conically pointed. 
The specimens are females, not yet sexually mature. 
The species is without any doubt different from Ascaris macruri, as is shown by a 
comparison with this form. 
7. Filaria (Spiroptera) cirrohamata, n. sp. (PI. I. figs. 14-16). 
Specimen labelled : “ Ascaris from the stomach of Phalacrocorax verrucosus, &c.; 
along with Ascaris spiculigera.” 
Two specimens were obtained, a male and a female. ' 
The wrinkling of the skin is 0‘006 mm. broad ; the head end exhibits two conical 
lips, and short, rudimentary neck frills. The first quarter of the oesophagus is somewhat 
narrower than the remaining portion, which is exceptional in being without any glandular 
coating. At a distance of 0T4 mm. from the head, the lateral line exhibits a three- 
pointed nuchal papilla. 
The male is 7 '5 8 mm. in length, and 0’25 mm. in breadth, the very long oesophagus 
measures somewhat less than half the entire length, while the tail occupies ^ of the same. 
