1907.] FROM ZA^^ZIBAR AN"D EAST AFRICA. 459 



have thought it advisable to give one here, the more so as the 

 type, which was presumably dejjosited with the rest of Riippell's 

 collection in the Senckenberg Museum at Frankfort, seems to 

 have disappeared. I cannot find the " median ligament to the 

 siphon " mentioned by Joubin (98) p. 27. 



Sepia singalensis. 



Sepia singalensis Goodrich ("96) p. 3, pi. 1. figs. 4-8; Hoyle 

 (: 04) p. 198. 



Localities. — Zanzibar, Eastern Reefs, 1901; two specimens, 5 

 [159, 162]. 



Previous record. — -Ceylon. 



Mr. Orossland states that this species is " pretty common " at 

 Zanzibar. 



EGG-CAPSULES AND EMBRYOS. 



OcTOPOD. (Plate XX. figs. 4-11.) 



Localities. — Zanzibar, 1901, East and West Reefs ; egg-capsules 

 [184]. 



Zanzibar, Eastern Reefs ; newly -hatched embryos from capsules 

 at the extremities of branched stalks [187]. 



Sections of these embryos showed very clearly the curious 

 epithelial structures which have been briefly described by Chun 

 (: 04) as " Das Borstenkleid der Cephalopoden." In this instance, 

 however, they are neither so numerous nor so closely packed as 

 to form a coat. In the hinder half of the body there are but few, 

 perhaps two to four in a transverse section (10 ;i thick); whilst 

 on the head they are more numerous, and at the bases of the arms 

 there may be from ten to fourteen in a single section. Here, too, 

 there are very many of them in the integument covering the eyes, 

 which does not seem to have been the case in the forms examined 

 by Chun. 



None of my sections showed the first stages in their develop- 

 ment. The earliest I could make out exhibits a rounded mass of 

 homogeneous material (PI. XX. fig. 4), which stains clearly but 

 not deeply with hsematoxylin and eosin. It measures about 

 0'02 mm. in diameter, and lies in a pit lined by epithelial cells. 

 There is in close relation with it a large ovoid nucleus (PI. XX. 

 fig. 5). At first sight it appears as though this nucleus were 

 situated within the homogeneous mass, but careful focussing and 

 measurement show that it is always outside. The spheroidal 

 mass gradually puts out a prominence on its superficial aspect 

 and assumes a pyriform shape, which becomes more and more 

 pronounced (PL XX. fig. 6). 



The elongation rapidly becomes considerable until a club-shaped 

 plug is produced, the head being turned inwards, the handle 

 outwards (PI. XX. fig. 7). The extreme length is about 0-06 mm., 



