488 MR, JAMES RITCHIE ON HYDROIBS [May 28, 



3. On Collections o£ the Cape Verde Islands Marine Fauna, 

 made bj Cjril Crossland, M.A. (Cantab.), B.Sc. (Lond.), 

 F.Z.S., o£ St. Andrews University, July to September, 

 1904.*— The Hydroids. By James Ritchie, M.A., 

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



[Eeceived April 18, 1907.] 



(Plates XXIII.-XXYI.t and Text-figures 142-144.) 



The forins described in the present paper were entrusted to me 

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

 localities ofi" the Cape Yerde Islands. Although the collection is 

 not a lai'ge one, it forms a useful addition to our rather meagre 

 knowledge of the Hydroid fauna of the northern portion of the 

 west coast of Africa. To the north of the Cape Verde Islands 

 specimens have been recorded from the Canary Islands, from 

 Madeira, from the Azores, and from the Soudan coast ; from the 

 south the ' Challenger ' records a solitary species, Cryptolaria 

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

 selves, so far as I can learn, records have been made by only four 

 workers §. In 1883 Allman, in his Report on the Plumularians 

 collected by the ' Challenger,' described the type of a new genixs, 

 Htrejitocaulus jndcherrimus Allm., found at Porto Pi-aya in 100 

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

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

 from the cable off St. Vincent in a depth of over 500 fathoms, the 

 species described being Eudendrium annulatum Norman 1864, 

 Lafoea tenelhda AXhu^^n. 1877, Zygophylax profunda Quelch 1885, 

 Plumularia variahilis Quelch 1885, P. delicatida Quelch 1885, 

 Antenmdaria irregidaris Quelch. 1885, A. 2}rqfunda Qxielch. 1885, 

 Aglaophenia acacia Allman 1883, and StrejJtocaidus 2iulcherri7nus 

 Allman 1883. More recently Professor J. Versluys has described 

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

 6'ertidaria {Besmoscyp/ms) brevicyathios (Vers. 1899), and Desmo- 

 scyjjhus ivflatibs Vers. 1899, a synonym for the D. gracilis of 

 Allman 1888, which has been" renamed SerUdaria versluysi by 

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

 collection, with the important addition that the gonosome is also 

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

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

 have been described by Dr. Armand Billard (1907), and these 

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



* The expenses of Mr. Crossland's collecting trip were borne hy tlie Carnegie 

 Trustees. 



f Communicated by the Secretary. 



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



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

 Scottish National Antarctic Expedition on its homeward voyage two species from 

 St. Vincent which were not represented among the specimens described in the 

 Report on the ' Scotia ' Hydroid Collection (Ritchie, 1907). These are JEucopella 

 cosnata? Hartlaub, 1901, and Sertularella fiisiformis? Hincks, 1861, both of which 

 are additions to the recorded Hydroid fauna of the Islands. 



