( 'lasslcamla ciassicaiula {Crej>l.) and its Ilosfs. 147 



roiid qui j)eut Ctre nn Nematode on un Ecliinorliynque : lo 

 ))reniicr est un Fhyllohothriinn atranie, que le professeiir 

 llaeckel a trouve dans I'dpaisseur de la poau. Le second est 

 un vcr tres lon<T, lo*;^ dans I'estomac d'un Zij>hius ('c\\o\\ii sur 

 les cotes de Siifede en avril 18(37 (Malm). Le prole.sseur Sir 

 Turner suppose que cVst un J-^cliinorliynque ; un nouvel 

 oxamen est indispensable. Nous ne savons si cet animal a 

 ete conserve." It is, of course, impossible to be certain of 

 the point from this brief notice, but it is not unreasonaljje to 

 suspect that this latter worm was another example of Crassi- 

 candi. Its occurrence in the stomach finds a parallel in the 

 case of the 'Terra Nova' material. 



Van Beneden also statics that F'daria crassicaudu occurs 

 in "Bahrnoptera rosirota." He does not inention his authority 

 for this statement, and it is not improbable that the reference 

 is again to the LS25 whale, which, as has been seen, has 

 aj>peared in the literature under a variety of names. 



The present specimen from Zip/iitis (19 L5) consists of an 

 anterior end only, the tail, which mii^iit have served as a 

 guide to the sex of the individual, having untbrtunately been 

 lost. The fragment is twisted in a s|)iral fashion, and 

 lueasures, when stretched as far as the twisting will permit, 

 about 30 cm. The anterior part of the body is thick, but 

 tapers off rather suddenly in the first quarter of an inch to 

 the very narrow oral extremity. I have been unable, on 

 clearing in creosote, to make out any genital organs. 



The * Terra Nova ' specimens did not include any heails, 

 the material consisting entirely of posterior portions. No 

 description of the anterior end, therefore, was ])0ssible. 

 Creplin's original material did include complete individuals, 

 and a figure of the oral extremity of one of them is given by 

 that autiior*, but the features of the head are very vaguely 

 indicated, and the figure does not appear to agree very closely 

 with the description given. Creplin's descri|)tion of the 

 mouth is as follows : — " Os terminale, subrotiindum, aut; 

 ])otius aubtransversum, subellipticum, minimum, margini 

 insigni, tumido, notlulis experte, cinctum."' 



Supposing that the determination of the present specimen 

 is correct, I am now able to give what is, I hope, a more 

 jnecise description of the head of this species, together with 

 a figure. Accordijig to my findings, the mouth is a narrow 

 .slit-like aperture whose long axis runs not in a transverse 

 but in a dorso-ventral direction. Its margin is certainly 

 conspicuous, but hardly tumid. It is lined with a very thick 

 cuticle, which is an invagination of the external cuticle of 



* L. c. \)\. lii, tl^'. o. 



