86 THE VOYAGE OF H.M.S. CHALLENGES. 



The spirals are also wound from left to right ; they are somewhat irregular, about five in 

 three centimetres, and about 1'5 cm. in diameter. In this specimen the polyps are partly 

 preserved, but not so distinctly as in the one first described. Ellis mentions a specimen 

 seven feet long with a stem " not thicker at the base than the quill of a lien's feather "; 

 the one which he figures was two feet long, the thickness of a writing pen, and curled and 

 twisted in a remarkable manner. On stems of medium diameter the spines are arranged in 

 distinct spirals, passing from right to left, but on the basal portion of a stem, and on those 

 which are relatively thick, the marked spiral arrangement is lost. PI. XII. fig. 10 

 represents what I regard as the typical arrangement. In addition to the spiral arrange- 

 ment, the spines form longitudinal rows, ten or eleven of which may be counted from one 

 aspect. The members of a row are of equal size, but the rows on the outer margin of the 

 spiral stem are longest, and there is a gradual diminution in size towards the inner 

 margin where the spines are quite short and pointed. The longest spines are separated 

 by an interval which is about equal to their length, and this distance corresponds to the 

 interval between the spirals. The longest spines are conical, only slightly tapering, and 

 have a blunt apex. 



A specimen in the Museum of the Royal College of Surgeons of London (C 45 of the 

 Catalogue) is the only other specimen I have seen which appears referable to this 

 species. The stem is about 2*5 mm. thick, and consists of about twenty-seven spiral coils 

 which average 2 "5 cm. in diameter. The apical portion of the stem is not preserved, and the 

 spines have lost the regular spiral arrangement in the upper portions of the specimen. 

 In the Copenhagen Zoological Museum I found two or three specimens labelled 

 Cirripathes spiralis, which, however, do not belong to that species as here defined, but 

 approach Dana's Cirripathes anguina closely. The fact that I have found only one 

 truly spiral specimen amongst the older collections to which I have had access — the British 

 Museum specimens have been received during the past few years — makes it possible that 

 the species here described as Cirripathes spiralis may not be the same as that of 

 Pallas, Ellis, &c. There appear to be no means of definitely deciding the question at 

 present. 



Habitat. — Indian Ocean (Pallas); Molucca (Ellis); ? Norway (Briinnichen); ? Mediter- 

 ranean (Baker); Ceylon (Ondaatje), Brit. Mus.; Kurrachee (Murray), Brit. Mus.; East 

 Indies (Stokes), Mus. Roy. Coll. Surg. Lond. 



Cirripathes ? paucispina, n. sp. (PI. XII. fig. 6). 



Stem simple, only slightly tapering. Sclerenchyma light brown, with six longitudinal 

 rows of distant short spines. Diameter of stem 1*5 mm. ; zooids not observed. 



The type specimen of this species is in the British Museum Collection (Reg. No. 

 73.4.26.1), and consists of two fragments measuring together about 23 cm. The 



