[42] MR. JAMES RITCHIE ON' HYDROIDS [May 28, 



On Collections o£ the Cajje Verde Islands Marine Fauna. 

 made by Cyril Crossland, M.A. (Cantab.), B.Sc. (Lond.), 

 F.Z.S., o£ St. Andrews University, July to Sej)teuiber, 

 190i.*— The Hydroids. By James Ritchie, M.A., 

 B.Sc, Fullerton Scholar, University of Aberdeen f. 



(Plates XXIII.-XXVl.J and Text-figures 142-144.) 



Tlie forms described in the present paper were entrusted to me 

 for determination hj Mr. Crossland, who collected them in various 

 localities ofF the Cape Verde Islands. Although the collection is 

 not a laige one, it forms a useful addition to our rather meagre 

 knowledge of the Hydroid fauna of the northern portion of the 

 west coa-st of Africa. To the north of the Cape Verde Islands 

 sjiecimens liave been i-ecorded fi-om the Canary Islands, from 

 Madeira, from the Azores, and fi-oui the Soudan coast ; from the 

 south the ' Challenger ' records a solitary species, Cryptolaria 

 diffusa AUm. from Sierra Leone ; while from the islands them- 

 selves, so far as I can leai'n, recoi-ds have been made by only foiu- 

 workers §. In 1883 AUman, in his Report on the Plumulariaus 

 collected Ijy the ' Cliallenger,' described the tv^ie of a new genus, 

 Streptocaulus jndcherrimns Allm.. found at Porto Pi-aya in 100 

 fathoms. In July 1885 Mr. J. J. Quelch described a small collec- 

 tion of deep-sea Hydroids, comprising nine species, and obtained 

 from tlie cable ofl' St. Vincent in a depth of over 500 fathoms, the 

 species described being Eudeiulrium amiidatum Xorman 1864, 

 Lafo'ea teveUula AWmau 1877, Zyyophylax profimda Quelch 1885, 

 riumidaria variabilis Quelch 1885, P. delicatida Quelch 1885, 

 Antennularia irreyidaris Quehh 1885, A. pi-ojunda Quelch 1885, 

 Aylaophenia acacia Allman 1883, and Strepiocauliis pidcherrimiis 

 Allman 1883. More recently Professor J. Versluys has described 

 two species from Isle Branco, one of the "Windward Group, 

 iSei-tularia {iJesmosci/p/ius) Irevicyathus (Vers. 1899), and Besmo- 

 scyphus inflatiis Vers. 1899, a synonym for the b. gracilis of 

 Allman 1888, which lias been renamed Sertnlaria versluysi by 

 Professor Xutting (1904). Of these the latter occurs in our 

 collection, with the important addition that the gonosome is also 

 pre.sent and is here described for the first time. Lastly, within 

 the past month or two collections made by tlie ' Talisman '■ in 1883 

 have been described by Dr. Arniand Bdlard (1907), and these 

 include a few species from two localities off the Islands. In lat. 



* The expenses of Mr. Crosskud's collecting trip were borne by the Caraegie 

 Tmstees. 



+ Communicated by the Seceetaet. 



X Kor explanation of the Plates, see p. 514. 



§ Since this paper was written I have fonnd in the collections made by the 

 Scottish National Antarctic Expedition on its homeward voyage two species Irnm 

 St. Vincent w hidi were not represented among the specimens described in the 

 Report on the 'Scotia' Hydroid Collection (Uitcbie, 19('7). These are Eurojiflla 

 crenata? Harthuib, 1901, and SerMarella fusifonnis ? Hincks, 1861, both of which 

 are additions to the recorded Hydroid fauna of the Islands. 

 488 



