298 CLAUSj OM THE 



some analogy in tlio wliole habit may be perceived with some 

 Siphoiiostomata ; but the true LeriicCcej and Lernseoceva 

 decidedly occupy a loAver stage than the LernEeopodaj sincC; 

 together with a complete want of segmentation in the body, 

 the cephalic members more closely approach the larval con- 

 dition. 



In Burmeister's figures of Lerncnoceru cypriiiacea, I find, 

 in the cephalic members, that the second pair of antennae is 

 composed of many-jointed branches, and are consequenth' 

 almost identical with the second pair of feet in the NaiqjUus- 

 I'onn. In the oral organs, on the other hand, the jaws 

 lodged in the suctorial tube appear to be formed like the 

 mandibles of the Cyclopidie, and the contiguous palpi are 

 also of considerable size. The jaw-feet, on the contrar}-, 

 appear to be replaced by those two pairs of arms, the smaller 

 of M"liich corresponds to the maxilhe, whilst the second and 

 larger two-branched pair corresponds to the jaw-feet. If wc 

 imagine the two external fleshy arms to be groMn together 

 at the points, w^e shall have the attachment-organ of the 

 Lcrnffiopoda, and which, moreover, in some forms, e. y., 

 Brachidla inqmdica, also supports lateral appendages. The 

 absence of articulation has also extended to the first jav - 

 feet. The oral organs in Lcrnmi brancltiuVis would also, 

 perhaps, admit of a similar explanation ; of which organs, it 

 must be confessed, we are at present in want of an accurate 

 representation. In the genera Peniculiis, Petiella, and Ler- 

 nmonema, the cephalic members are still more simplified; 

 at any rate, neither Nordmann {Penellu sagltta, Peniculas 

 'plstula) nor V. Beneden {Lermeonema Miisteli) have pointed 

 out definite oral members in the female sex, although the 

 antennte of both pairs are replaced by corresponding appen- 

 dages. In the genus Lophoirra Edwarchi [Lepidolejjrus 

 ccelorhynchns), of which Professor Kolliker has sent me for 

 examination the only specimen as yet met with, I did not 

 find the least trace of oral members ; the antennae assumed 

 the form of unjointed processes; the mouth appeared to be 

 surrounded by stunted chitinous rods (figs. 11 and 12). 

 Lastly, we find among the Lenicece creatures which, together 

 with a M'holly unjointed body, are also deprived of antennte, 

 and in their outward form present a striking resemblance 

 to the Trematoda ; I mean, the parasitic SaccuUna, Tliomps. 

 iPt'lto(jaster, llathke) which is attached to the abdomen of 

 the Pagiirl and anourous Crustacea, and w hicli w as regarded 

 by Diesing as a Trematode under the generic name Pachyob- 

 della. It Avas the observation of the Nauplius-like larva, 

 Avith which, in fiict, CaA'olini was acqnainted in the last 



