[46] sin. JAMES HITCniE ox HTDROIDS [^^^7 28, 



except towards the tips of the branches, with a faiut biown. The 

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

 very numerous, irregularly disposed bi'Sinches which, arising at a 

 small angle, lie for a short distance almost parallel with theii- 

 parent shoot and there^after gradually 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 linging occui-s. There 

 is no membranaceous cup surrounding the base of the hydranth. 

 The hj'di-anths are relatively long, O'O mm., slightly bulging 

 beneath and tapering grailually 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 thedi-stal four, which generally 

 appear to be 2:ilaced in a whorl, are sciittered. 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. Gro'n'ing on a seaweed taken from piles of piei'. 

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



Owing to the absence of the gonosome this species cannot be 

 given a definite generic place within the family Corynidas a.s defined 

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

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

 characters lie between those of Actinogonium pusilliim. (Tan 

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

 Syncoryne sarsii Loven 1835. Fiom 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 

 size, its complicated branching, its more frequent rings. 



The specimens bear many cieeping {xilyzoon colonies [ClionellaV) 

 and occasional stalked protozoa and diatoms. 



Family Penxariid^. 

 Pexxaria cavolixii Ehrenberg 1832. 



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

 been obtained from one locality. They agree in genei-il with 

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

 may be noted : — The colonies are le.ss i-obust than those described 

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

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

 planes are set forwai-d on the stem, as in many Plumularian 

 sjiecies, so as to meet at an angle vaiying from almost 180"^ to 

 less than 20°. Einging 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 hydrauth-bearing raniuli, instead of being wholly ringed 

 as described and figureil bv Allman, be;ir a small number of bas;il 

 492 



