38 



macrocnemes i>t' the ventral quartettes extend only al. out one-third the distance between the 

 stomatodseum and the aboral pole and the microcnemes are, ol course, even shorter, the longer 

 ones being slightl) ter than the second and third protocnemes. 



aspedonemes in the form ol relatively short digitiform processes, are scattered at 

 intervals alen- the entire length of the macrocnemes, and the bunches of them, which are so 

 evident in ( ranaeeus and C. americanus a short distance below the stomatodaeum, though 



rather inconspicuous on account of the shortness of the craspedonemes composing 

 them. In structure, also, the craspedonemes differ from those of C. amerïcanus, the two limbs 

 of the filament being separated 1>\ a distinct band of ectoderm and mesogloea, instead of being 

 tically in contact compare figs. 1 ; and i.j, pi. I 



All the fertile mesenteries (macrocnemes) contained only ova in the two individuals 

 examined histologically ; there was nut tin- slightes tracé of hermaphroditism. TIn- ova when 

 fully developed contain a considerable amount of volk and have a dark brown colour, thus 

 making the macrocnemes especially conspicuous. 



Systematic. The identification of this form with Kwietniewski's C.elorigatm (1898) 

 upon somewhat uncertain grounds, owing to the insufficiency of the data eoncernine; that 

 species. The form considered here resembles it, however, in the dimensions of the body and 

 tentacles and in that only two mesenteries extend aborally beyond the middle of the column. 

 These similarities, taken with the fact that the two forms come from the same general locality, 

 form the basis of the identification. 



It is not improbable that the C. nobilis of Haddon and Shackelton (1893) may also 

 be identical, luit in this case also the data furnished by the sponsors are too incomplete to 

 allov. of certainty. The name nobilis has priority over fimèriatus if the two forms be really 

 identical, luit it seems preferable, lor tin- present, to employ a distinguishing term, leaving open 

 the question of the identity with nobilis. 



7. Pachycerianthus monostickus n. sp. 



Stat. 1S1. Ambon anchorage, reef. 2 ex 



The two individuals which I refer to this species were both rather short, stout forms 

 with relatively long slender tentacles (PI. I. fig. 8). The greatest diameter of the column was 

 somewhat below the middle. where it tapered slightly to the rounded aboral extremity and 

 panding again a little toward the margin, which was longitudinally ridged. 



I he marginal tentacles were Ion- and slender and were 47 in number. they were 

 arranged in two cycles, which, for the most part, alternated with one another, although the 

 alternation was not quite regular. The labials were 48 in number and were in marked contrast 

 with the marginals, being, in the first place, very short and, in the second place, arranged in 

 ries, a condition which sug the specific name that has heen chosen. The 



rnedian ventral tentacle w; ent. 



Dimensions. — The column measured 4.5 cm. in length, its greatest diameter being 



