REPORT ON THE TUNTCATA. !»1 



following account. A short generic diagnosis, and a description of the six species for 

 the reception of which the genus was formed, were given in the third part 1 of my Pre- 

 liminary Report on the collection. The morphological peculiarities, however, were 

 merely referred to ; while histological details, and remarks on the structural characteristics 

 and tluir hearing on our knowledge of the other members of the group, were omitted as 

 being out of place in a Preliminary Report intended merely to supply a short description 

 of the new species. 



The genus Culeolus contains six species of Simple Ascidians, which in the first rough 

 classification of the collection were arranged in the genus Boltenia on account of their 

 long peduncles. A short examination, however, of their details of structure sufficed to 

 show that they could not be referred to that or any other known genus. Further invest i- 

 gation revealed several peculiarities common to the species, such as the structure of the 

 branchial sac, in which they differed from all previously known Simple Ascidians ; 

 it likewise showed that, although well-marked specific differences were present, and 

 characteristics might be taken from almost every organ, the six species were closely allied, 

 and possessed common characters, which rendered their union under one generic title 

 necessary. 



The species may be distinguished by means of external characters alone, as shown in 

 the following table : — 



Culcohis. 

 I 



Peduncle turned posteriorly. Peduncle turned anteriorly. 



Dorsal end fringed with papillae. Dorsal end not fringed. Dorsal end fringed with papilke. Dorsal end not fringed. 



I I I I 



C. recumbens. C. perlucidus. | I 



Surface even. Surface very uneven. Surface even. Surface very uneven, 



ft perlatus. C. murrayi. C. mosdeyi. C. wyvillc-thomsoni. 



Of three of the species — Culeolus wyville-thomsoni, Culeolus perlatus, and Culeolus 

 moseleyi — only a single specimen was obtained, consequently in these the examination was 

 limited to those points which were necessary for a diagnosis of the species, and the 

 description below contains in addition only such observations as could be made without 

 further injuring the unique specimens. The other three species, each of which is repre- 

 sented by more than one specimen, will be described more in detail, commencing with 

 Culeolus murrayi, which may be taken as the type of the genus. 



Culeolus murrayi, Herdman (PI. VIII. and PI. IX.). 



Culeolm murrayi, Herdman, Preliminary Report, Proc. Roy. Soc. Edin., 1880-81, p. 83. 

 External Appearance. — Like the other species of the genus it consists of two parts, a 

 more or less oval " body " borne on the summit of a long thin " peduncle " (PI. VIII. fig. 1). 



1 Proc. Roy. Sue. Edin., 18S0-S1, p. 82. 

 (ZOOL. CII.U.L. EXP. — PART XVII.— 1 882.) R 13 



