[56] MR. JAMES RITCHIE OS HYDROIDS [May 28, 



are frequently marked by several " regeneration-lines," as in 

 specimens from the IS'orth Sea in my possession. 



The coppinia-gonosome is not present. 



Locality. Creeping on Soleniopsis dendriformis, which was found - 

 gi'owing on the bottom of a lighter : St. Vincent, Cape Yerde 

 Islands; 30th July, 1904. 



CuspiDELLA HUSiiLis TTincks MS. it 1866. 



Minute hydi-othecre arising here and there from a tubular 

 stolon creeping upon SGleniojysis dendriformis. The hj'drothecie 

 are delicate and cylindrical, generally 02 mm. in height by about 

 0"05 in diameter, although a rare specimen attained a height of 

 0-4 mm. They show in many cases a tendency to conti-act 

 .slightly towards the proximal end, while the distal end Ls cro\rueil 

 by convergent opercular segments. They agree with Hincks's 

 description and figures of the species. 



Gonosome not known. 



Locality, (a) Cieeping upon a polyzoon, which was obtained 

 glowing on the bottom of a lighter : St. Vincent, Cape Verde 

 Islands; 20th July, 1904. — (?») Upon Soleniopsis dendriformis; 

 30th July, 1904. 



Family CAiirASULAEiiDjE. 

 Clytia gexiculata Thornely 1 904. 



Several small colonies, the lai-gest rather imder 1 cm. in height, 

 growing on a pol}"zoon. The specimens agree in everj' respect 

 with the original description and figures, the peculiar method of 

 branching lieing particularly noticeable. The hydrothecfe, which 

 are some 1"1 mm. long by 0'6 mm. in greatest diameter, bear 

 from 18 to 20 long teeth; each tooth being strengthened h\ a 

 median fold which is continued for a short distance down the 

 wall of the hydrotheca as a more or less definite line. 



The gonangia vary somewhat as resrards their opening, some- 

 times having a plain, cj'lindrical, distal end ; at other times with 

 a di.stinctlv constricted neck below the aperture. Sometimes they 

 arise in pairs from the base of a. pedicel. 



Locality. Growing on poh'zca found on the bottom of a lightei- ; 

 a single specimen on the back of a small crab. St. Vincent, 

 Cape Verde Islands; 30th July, 1904. 



Obelia dichotojia (Linnieus 1758). 



A few delicate colonies, the laigest only 4 mm. high, occur on 

 the cai-apace of a minute ciab. The stems, which are nnfascicleil, 

 are divided by slanting nodes into regular internodes 0-4 mm. in 

 length, from the distal end of each of which arises a hydrotheca. 

 Bi-anches are fi-equent, sometimes 1-5 mm. in length, arising in 

 every case from the side of a pedicel. They are thus alternate, 

 and, like the stem, they bear alternate hydrothecae, from the 

 pedicels of which smaller branchlets with one Indrotheca may 

 502 



