6 ASHWORTH & HOYLE, Species of Ctenopteryx. 



eye, which was probably more transparent in Hfe, and 

 crossed by three round pigment spots. On the right side 

 this area is larger, not so regular in shape, and less clearly 

 defined. On the lower side of the head are two elongate 

 " olfactory organs," apparently not quite so triangular as 

 those of Jatta's specimen. The buccal membrane is well 

 developed. The characters of the body in general, the 

 front edge of the mantle, the nuchal cartilage, and the 

 arms seem to agree with those of Jatta's specimen. 



The differences do not appear to us of generic value, 

 except as regards the presence or absence of a sinus in 

 the anterior margin of the ocular opening. A difference 

 in this respect has usually been regarded as marking a 

 generic distinction, but we do not think it of sufficient 

 importance to outweigh the many points of resemblance, 

 especially as it seems to vary in extent in different 

 examples (compare Appellof's description and figure with 

 the description of our specimen above), and may prove 

 to be dependent on the age of the specimen. 



Jatta himself subsequently (:03) came to the con- 

 clusion that his species should be referred to the genus 

 Ctenopteryx. 



It is more difficult to form an opinion as to the 

 specific identity of these two forms. Dr. Pfeffer (:00) has 

 united them ; for ourselves we would merely say that we 

 have a strong suspicion that they will ultimately prove to 

 be the same, but pending further evidence it is advisable 

 to retain Dr. Jatta's name. 



Sepioteuthis sicula, Riippell : Verany ('51, p. 75, pi. 27). 



Dr. Pfeffer has regarded this form as identical with 

 Appellof's species, but the characteristic features ot 

 Ctenopteryx are not indicated by Verany in his drawing, 

 though a phrase in the description of the colour might be 



