1907. J FROM rilE CAPE TERDE ISLAXDS. [59] 



average 0-4 uini. in loiigtli. The liydrotliecae are free for rather 

 more than half tlieir height distally, the free portion being sharply- 

 divergent. Tlie margin is divided into two lateral teeth, and 

 there are two opercular flap.s. The .specimen.s agree closely with 

 the descriptions and figures of Hineks (1868) and Nutting (1904). 



Gonangia not present. 



Locality. Porto Grande : shore -pools ; ? July 1904. 



Sertclaria mayeri Nutting 1904. 



Several specimens of this species have been obtained. 'J'he 

 specimens agree in all respe(;ts with the description given by 

 Nutting, except that in our forms, which are smaller than the 

 American specimens — the maximum being about 7 mm. — the 

 hydrotheca; appear to be rather more closely approximated, 

 the length of an internode being only 06 mm. While in many 

 cases the margin and opei-culum had collapsed, as described by 

 Nutting, in others this portion of the hydrotheca retained its 

 form, and two large lateral teeth, with sometimes a minute 

 median superior tooth, and a two-flapped operculum could be 

 distinguished. 



Gonosome not known. 



Localities, (a) Porto Grande, St. Vincent, Capo Verde Islands : 

 creeping on seaweed found in shore-pools. — (//) On seaweed 

 found by diving among coral in 2 fathoms of water : St. Vincent, 

 22nd July, 1904. 



Sertdlauia verslu ysi Nutting 1 904. ( = Desmoscyphus gracilis 

 Allman 1888.) (Plate XXIV. figs. 2, 3, 4, 5, 6, & text-fig. 144.) 



A large number of colonies varj'ing from 2 to 4 cm. in height. 

 The .stem is erect, unfascicled, .ami springs from a spreading mass 

 of hydrorhiza. The lower jiortion of the stem for a disbinee 

 varying from 3 to 10 mm. is smooth, thick-walled, and unbranelied 

 and usually bears two stiaight internod&s. Tlie remainder, which 

 is separated from the mibrancheil portion by a long, sloping, 

 splice-like joint, is divided by slanting nodes into regular inter 

 nodes about 0'7 mm. in length, each bearing three hyilrothecie — 

 two on one side, one on the other. From beneath the lower of 

 the two hydrothecaj the branches arise. They are about 4 mm 

 long, are legularly alternate, thus giving the colony a plumose 

 appearance, an<l are di\idi'd into internodes, 0'4 mm. long, by 

 nodes whicli slope from behind forward and downward. They 

 are placed slightly on the front of the stem, and are borne on 

 a long stem-proce.ss, but arise at an angle of 60° rather than at 

 right angles as described by Nutting. 



The liydrothcc-e are placed on the front of stem and branch(>s 

 on the former they are alternate and apart, while on the latter 

 they are opposite, and contingent for the gi-eater part of theii 

 length, the di.stal free portion being bent at right angles to the 

 adnate portion. The hydiotheca pairs are distant IVom one 

 another about the height of a hydrotheca. The hydrotheca;, short 



c* 505 



