W. E. HOYLE. 



" The young Cephalopod submitted to me is a larval CitUiteuthis. That it belongs 

 to the Histioteutliidae is probable at the first glance, from its general appearance, and 

 examination with a lens converted the suspicion into certainty. The peculiar form of 

 the l)ody and fins, as well as the lack of a sinus in the ocular opening, and the strong 

 pigmentation occur only in this manner in the young of Enoploteuthidse and Histioteu- 

 thidae. The numerous rows of suckers on the tentacular club and their prolongation 

 down the stem of tlie tentacle show that it cannot be an Enoploteuthid. 



" It must be admitted that the characteristic develop- 

 ment of luminous organs is not yet shown, but closer 

 investigation would probal)ly show the rudiments of them. 

 The smallest specimen (with a mantle-length of 6 mm.) 

 in my possession already possesses them ; Init I believe 

 Professor Chun has a still smaller one in which they are 

 not yet visible. 



" Other characters which show the specimen to be a 

 Histioteuthid are the relatively broad funnel cartilages, the 

 form and comparative size of the suckers, especially their 

 relatively small size on the ventral arms. 



" Finally it may be shown by a process of exclusion 

 that it cannot belong to any other family. The Bathyteu- 

 thidse have fins of quite difi'erent shape, no suckers on the 

 tentacular stem, and much smaller ones on the club ; young 

 specimens have quite a different appearance. 



" The Gonatidse have more than two rows of suckers on 

 the arms. 



" The Tracheloteuthida3 are essentially different in form 

 and have much smaller suckers on the tentacles ; in addition 

 to which, the terminal cone of the pen is clearly visible through the integument, and 

 finally the young of this family are slender, colourless and ghost-like. 



"Young ArchiteuthidjB have not yet been seen liy me, nor. so far as I am aware, 

 by anyone else; they must, however, be quite different from the specimen now under 

 consideration." 



I removed a portion of the mantle and had a series of sections prepared, hoping to 

 find traces of the luminous organs in an early stage of development. I was, however, 

 unable to find any structures which could be so interpreted. 



