1907.] FROM THE CAPE VERDE ISLANDS. 509 



portion of the bend a second stem-internode arises, at an 

 angle with the first. Each hydroclade lies in a line with the stem- 

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

 which the succeeding stem-internode is thrown ofi' at an angle 

 (PI. XXV. fig. 4). The structure of the colony thus comes to 

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

 not mentioned by Nutting, issues from the angle between the 

 hydrotheca and its internode. The ai-rangement of the nemato- 

 phoi'es 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-internodes, of which there are only fo\n' in our 

 largest specimen, the nematophores vary from 3 to 5. 



Gonosome not present. 



Locality. St. Vincent, Cape Verde Islands, 15 fathoms i 

 30th July, 1904. 



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

 in connection with the Gulf of Manaar Pearl Fishei'ies 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). 



Aglaophenia 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 a.nterior surface 

 of the stem. The stem is divided into internodes, 0*5 mm. in 

 length, each bearing a hydroclade 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 0-35 mm. long, each 

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

 one proximal and opposite the intrathecal septum and extending 

 completely around the internodal wall ; the other distal and less 

 pronounced, opposite the base of the supracalycine nematophores, 

 and sloping slightly upwards. 



The liydrothecfe are small, 0-25 mm., closely approximated and 

 rather deep, with a concave anterior profile, and a slightly oblique 

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

 antei'ior 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 nematophore is adnate for little more than 

 half the height of the hydrotheca, and has but a short divergent 

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

 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 corbulas are about 1'7 mm. in length by 1 mm. 

 in breadth, elongate-oval in shape, with 7 or 8 pairs of corbula- 



