232 Miscellaneous. 



The sac containing the larvae is about three fourths of an inch 

 long and half an inch broad, with a short tubular prolongation open 

 at the extremity. It was uncertain whether the sac formed part of 

 the intestine. 



The dish of stewed terrapins was suspected to have been a mix- 

 ture of the diamond-back, Emys palustris^ and the red-bellied ter- 

 rapin, E. ruc/osa. This is not the only instance of the occurrence of 

 bots in turtles, as Prof. A. S, Packard notes the case of larv^ being 

 found in the skin of the neck of the box-turtle, Cistudo Carolina *. 

 —Proc. Acad. Nat. Sci. Philad. December 13, 1887, p. 393. 



A new Member of the Deep-ivater Fauna of the Freshwater Basins. 

 By Dr. 0. E. Imhof. 



In my first deep-water investigations in the summer of 1883 and 

 during the continuation of these studies I regularly found in a 

 number of lakes (c. g. the Lake of Zurich) a fine, transparent, seti- 

 gerous worm, of which permanent preparations were made from 

 specimens obtained in the Lungeno lake, where it was particularly 

 plentiful, on the 17th March, 1884. I paid no particular attention 

 to it, because from its abundance and the remarkable facilities 

 offered by the nature of its body for exact investigation I regarded 

 it as certainly already described. Zeppelin's memoir upon Cteno- 

 drilus monostylos furnished the inducement to examine this Chseto- 

 pod more carefully. It is a form which can hardly be ranged in 

 any known genus. It comes near to the genera Ctenodrilus and 

 Parthenope, of which only marine species are known. 



According to ForeljDuplessis, and Grube the following Chsetopoda 

 occur in the deep-water fauna of lakes : — Tuhifex rivulorum, 

 Lamk. ; T. velutimis, Grube; Clitellio Lemani, Giuhe = By thono- 

 mus Lemani, Gt.=B. profundus, J)u^\. = Li(mhriculus pellucidus, 

 Dupl. 



Noticeable anatomical peculiarities of the new form are : — 

 There is no ciliary coat on the surface of the body. The setse 

 exist only in one series of tufts on each side, directed towards the 

 ventral surface. The setce are thin, straight nearly to both ends, 

 where they are slightly bent in opposite directions, and cleft into a 

 fine fork at the free end. At rather more than one third of the 

 length we find a slight enlargement of the part immersed in the 

 body. I have not hitherto found individuals with generative 

 organs, but, on the contrary, always multiplication by division. 

 The body externally appears to be composed only of four segments, 

 each of which bears two tufts of from four to six setae. All the 

 setae are of similar structure. The nervous system is distinctly 

 developed. It consists of a cerebral ganglion situated above the 

 wide, thin-walled, anterior division of the digestive canal ; this is of 

 a broad band-like form with a slight constriction in the middle. 



* < American Naturalist/ 1882, p. 598. 



