1881.] THE SURVEY OF H.M.S. 'ALERT.' 53 



Hah. Elizabeth Island, 6 fathoms, on Fucus, in company with 

 Schizoporella hyalina. Two colonies. 



Obs. Were it not for the fact that only one sjjecimen of the ori- 

 ginal species has occurred on which to base its characters, it would 

 have seemed advisable to make a new species of this, in consideration 

 of its being spined. 



Smittia trispinosa, Johnston, var. uov. ligulata. (Plate VI. 

 fig. 9.) 



Biscopora trispinosa, Johnston, Edin. Phil. Journ. xiii. p. 222. 



Lepralia trispinosa. Busk, Cat. Brit. Mus. Polyzoa, ii. p. 70, 



Smittia trispinosa, Hincks, Hist. Brit. Mar. Polyzoa, p. 3.53, 

 pi. xlix. figs. 1-8. 



A. yellowish patch embracing the base of a colony of a branching 

 Cellepora. The cells are markedly diamond-shaped ; the surface is 

 much perforated, a marginal series of larger perforations being 

 distinguishable from the rest ; a raised line is irregularly present 

 around the cells. The lower side of the mouth is much raised, each 

 of the inferior angles being occupied by a smooth swelling, often of 

 different sizes on the two sides ; sinus small. A very peculiar, long, 

 narrow, strap-shaped avicularium extends from close to one or both 

 sides of the mouth downwards to a distance of about half the total 

 length of the cell ; the mandible points downwards ; a few elongated 

 or oval small avicularia sometimes present on the sides or behind 

 the mouth. Surface hyaline. Ovicell globular, but flattened, upper 

 edge bearing a semicircle of large punctures. Spines absent or 

 broken oif. 



Hab. Victoria Bank, off S.E. Brazil, 33 fathoms, on Cellepora, 



Obs. The long avicularium described evidently represents the large 

 triangular form described by Hincks (/. c.) as sometimes present ; for 

 it is sometimes replaced by such a one of almost the normal 

 characters. A similarly placed but generally broader form occurs 

 in a specimen described as Lepralia reticulata, var. inceqiialis, by 

 Mr. A. W. Waters, from Naples. 



Retepora cellulosa, Oken ? 



Frondipora cellulosa, Oken ? " Lehrbuch Nat. 63." 



Retepora cellulosa, Lamarck, Hist. Anim. s. Vert. ed. 2, ii. p. 27ti. 



A small and worn fragment without ooecia perhaps represents this 

 species ; but spines and long rostrum are alike absent. Most cells, 

 however, could not have had a long rostrum, but are in the con- 

 dition represented by plate cxxiii. fig. 7 of tbe Brit. -Mus. Catalogue 

 of Polyzoa, vol. ii., with the addition of avicularia. 



Hab. Borja Bay (north-western part of Straits of Magellan), 

 20 fathoms. 



Retepora altisulcata, sp. n. (Plate VI. fig. 5.) 

 Frond flattish, slightly undulated ; fenestrse elongate-oval, 

 generally about equal in diameter to the reticulations, which are 

 almost cvlindrical. Zooecia crowded, oblong. Surface marked with 



