492 MR, JAMES RITCHIE ON HYCROIDS [May 28, 



except towards the tips of the branches, with a faint brown. The 

 stem is slender, O'l mm. in diameter, and soon breaks up into 

 very numerous, irregularly disposed bi-anches which, arising at a 

 small angle, lie for a short distance almost parallel with their 

 parent shoot and thereafter gradvially diverge from it. Branches 

 even of the fourth order are present. The colonies are wrinkled 

 throughout, but less strongly in the middle portions of the polyp- 

 bearing branches ; while beneath the polyp, on the stems, and on 

 the older portions of the branches distinct ringing occurs. There 

 is no membranaceous cup surrounding the base of the hydranth. 

 The hydranths are relatively long, 0'5 mm., slightly bulging 

 beneath and tapering gi'adually upwards towards the tip and down- 

 wards to form a long " neck." The tentacles are from O'l to 

 0"15 mm. in length, and except for the distal four, which generaUy 

 appear to be placed in a whorl, are scattered. They vary slightly 

 in number. Thus of 10 heads examined, one bore 12 tentacles, 

 four bore 13, three bore 14, and on two 15 were found. 



Gonosome not present. 



Locality. Growing on a seaweed taken from piles of pier. 

 Porto Praya, Santiago, Cape Yerde Islands ; 12th August, 1904. 



Owing to the absence of the gonosome this species cannot be 

 given a definite generic place within the family Corynidpe as defined 

 by Delage (1901). JSTotwithstanding I have assigned a specific 

 name to the form in order to facilitate references. The trophosome 

 characters lie between those of Actinogonium pusilliim (Van 

 Beneden 1844 ; Hincks, 1868, p. 45 ; Allman, 1872, p. 272) and 

 Syncoryne sarsii Loven 1835. From the former it differs in having 

 a more tapering polyp, numerous rings and wrinkles, and in 

 lacking a membranaceous cup beneath the polyp ; from the latter 

 it is distinguished by the shape of its hydranth, its much smaller 

 «ize, its complicated branching, its more frequent rings. 



The specimens bear many creeping polyzoon colonies ( Clionella ?) 

 and occasional stalked protozoa and diatoms. 



Family Pennariidjs. 

 Pennaria cavolinii Ehrenberg 1832. 



A number of colonies, frequently over 6 cm. in height, have 

 been obtained from one locality. They agree in general with 

 Allman's description (1872, p. 364), but the following variations 

 may be noted : — The colonies are less robust than those described 

 by Allman. The branches, while alternate, lie generally in two 

 planes, every other branch being in the same plane, and these 

 planes are set forward on the stem, as in many Plumularian 

 species, so as to meet at an angle varying from almost 180° to 

 less than 20°. Ringing is well marked, from four to six rings 

 occurring on the stem above the origin of each branch, and a 

 similar number at the base of the branch itself. Thus the 

 ultimate hydranth-bearing ramuli, instead of being wholly ringed 

 as described and figured by Allman, bear a small number of basal 



