1907. j FROM THE CAPE TERDE ISLANDS. 505 



average 0*4 mm. in length. The hydrothecfe are free for rather 

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

 divergent. The mai-gin is divided into two lateral teeth, and 

 there are two opercular flaps. The specimens agree closely with 

 the descriptions and figures of Hincks (1868) and ISTutting (1904). 



Gonangia not present. 



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



Sertularia mayert ISTutting 1904. 



Several specimens of this species have been obtained. The 

 specimens agree in all respects 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 

 hydrothecse appear to be rather moi'e closely aj)proximated, 

 the length of an internode being only 0-6 mm. While in many 

 cases the margin and operculum had coUajDsed, as described by 

 Nutting, in others this portion of the hydrotheca ret-ained its 

 form, and two large latei'al 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, Cape Yerde Islands : 

 creeping on seaweed found in shore-pools. — (6) On seaweed 

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

 22nd July, 1904. 



Sertularia versluysi Nutting 1 904. ( = Desmoscyplnts gracilis 

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



A large number of colonies varying from 2 to 4 cm. in height. 

 The stem is erect, unfascicled, and sj)rings from a spreading mass 

 of hydrorhiza. The lower portion of the stem for a distance 

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

 and usually bears two straight internodes. The remainder, which 

 is separated from the unbranched 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 thi-ee hydrothecfe — 

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

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

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

 appearance, and are divided into internodes, 0*4 mm. long, by 

 nodes which slope from behind forward and downward. They 

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

 a long stem-process, but arise at an angle of 60° rather than at 

 right angles as described by Nutting. 



The hydrothecfe are placed on the front of stem and branches ; 

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

 they are opposite, and contingent for the greater part of their 

 length, the distal free portion being bent at right-angles to the 

 adnata portion. The hydrotheca pairs are distant from one 

 another about tlie height of a hydrotheca. The hydrothecfe, short 



