1907.] KKOM THE CAPE VERDE ISLANDS. [63] 



portion of the Iieud a second stem-iuternotle arises, at an 

 angle witli tlie first. Each hydroclade lies in a line Avith the stem- 

 internode from which it arises, and from the posterior aspect of 

 which the succeeding stem-internode is thrown off at an angle 

 (PI. XXY. fig. 4). The .structure of the colonj^ thus comes to 

 resemble that of a helicoid cyme. (2) An unprotected .sarco.style, 

 not mentioned by Nbtting, issues from the angle between the 

 hydrotheca and its internode. The arrangement of the nemato- 

 phores agrees with that in Nutting's figure, pi. xiii. fig. 2, 

 except that the supracalycine nematophores more closely resemble 

 those in fig. 4, scarcely reaching the margin of the hydrotheca. 

 On the stem-iiiteinodes, of which there are only four in our 

 lai'gest specimen, the nematophores vary from 3 to 5. 



Gonosome not present. 



Locality. St. A^incent, Cape Verde Islands, 15 fathoms; 

 30th July. 1904. 



In the collections made by Professor W. A. Herdman, F.R.S., 

 in connection with the Gulf of Manaar Pearl Fisheries Investi- 

 gations, small specimens of this species occur similar in size to 

 those above described — " half an inch is the height of the largest 

 colony" (Thornely, 1904, p. 120). 



Agladpiienia marginata, sp. n. (Plate XXIV. figs. 7, 8, 9, 10.) 



Slender, monosiphonic colonies reaching a height of 6 cm. 

 The normal condition of the colonies is simple, for in only one 

 specimen was a branch found, springing from the anterior surface 

 of the stem. The stem Ls divided into internodes, O'S mm. in 

 length, each bearing a hj-di'oclade on a prominent, rounded and 

 perforated process lying midway between the nodes. The hydro- 

 clades are short, generally less than 3 mm., set forward on the 

 stem, alternate, and divided into internodes 0-3.5 mm. long, each 

 of which bears a hydrotheca. Two internodal septa are present, 

 (me pro.vimal and opposite the intrathecal septum and exteuiling 

 completely around the internodal wall ; the other distal and less 

 pronounced, opposite the base of the supracalycine nematophores, 

 and sloping .slightly upwards. 



The liydrotheca; are small, 0-2.5 mm., clo.sely apja-oximated and 

 rather deep, with a concave anteiior piofile, and a slightly oblique 

 margin marked by nine teeth, which increase in size towards the 

 anterior of the calycle. A distinct, horizontal septum traverses the 

 hydrotheca cavity about a fifth from the base. The supracalycine 

 nematophores are small, just reaching the level of the hydrotheca 

 margin. The mesial nematojihore is adnate for little more than 

 half the height of the hy<lrotheca, and has but a short divergent 

 " beak " free. There are two nematophores on each stem-iuteruode, 

 one opposite, the other distal to, the hydroclade-bearing process. 



The stem is of a horny-brown colour, which fades into a faint 

 yellow towards the tip. 



Gonosome. — The corlndje are about 17 unn. in length l)y 1 iinn. 

 in breadth, elongate-oval in shape, with 7 or 8 pair.i of corbnlii- 



50'J 



