REPORT ON THE SIPHONOPHOILE. Ill 



5. Cucullus campanula, HkL, synonymous with Eudoxia campanula, Leuckart 



(5, p. 43), is the free Eudoxia of Diphyes acuminata, Leuck. (5, Taf. iii.), 

 inhabitant of the Mediterranean. 



6. Cucullus subtilis, HkL, synonymous with Ersasa elongata, Will (65, p. 82, 



Taf. ii. fig. 30), is the free Eudoxia of Diphyes subtilis, Chun (88, p. 687), 

 also Mediterranean. 



Genus 13. Cuboides, 1 Quoy et Gaimard, 1827. 



Cuboides, Quoy et Gaimard, Ann. d. Sci. Nat. (Zool.), t. x. p. 19. 



Definition. — Eudoxida? with a cuboidal bract, bounded by six quadrangular faces, 

 twelve edges, and eight angles. Phyllocyst composed of a slender vertical canal, and 

 two broad horizontal lateral lobes at its base. (Eudoxise of the genus Cymba.) 



The genus Cuboides (PI. XLII.) comprises those very remarkable monogastric 

 Eudoxidse, which arise from the polygastric Monophyid genus Cymba (Genus 23, PI. 

 XLL). Its bract has the extraordinary form of a subregular cube, and is distinguished 

 by a very characteristic phyllocyst. This is composed of a slender, vertically ascending 

 canal, which usually includes an oleocyst ; and a wide basal diverticulum, which is 

 divided into two broad, horizontally diverging, and ventrally directed ' lobes. We may 

 compare these latter with the two symmetrical lateral canals of a bilateral Medusa, 

 whdst the ascending canal corresponds to the odd ventral vessel. The fourth, dorsal and 

 descending canal (preserved in Aglaisma) is lost in Cuboides. The basal diverticulum 

 of the latter is the proper phyllocyst. 



The genus Cuboides was founded by Quoy and Gaimard (loc. cit.) upon an isolated 

 Eudoxia, found in the Straits of Gibraltar, and called Cuboides vitreus. This is probably 

 the detached monogastric form of the polygastric Cymba enneagonum found by the French 

 authors at the same locality. It seems different from the species occurring in the Eastern 

 Tropical Atlantic, and figured by me in PI. XLII. as Cuboides crystallus. The figures 

 and descriptions of the French authors are too insufficient to identify the two fomis. The 

 first accurate description of this peculiar Eudoxia, its cuboidal hydrophyllium and bdobed 

 phyllocyst, was given in 1859, by Huxley (9, p. 63, pi. iv. fig. 5). He took it twice, 

 once on the east coast of Australia, and once on the south coast of New Guinea, called 

 it Cuboides vitreus, and suspected, rightly, that it might be derived from his Abyla 

 vogtii (loc. cit, pi. ii. fig. 3). Different from this Australian species is an Indian 

 species (Cuboides nacella, Hkl.),' and the Atlantic species, which I shall describe in the 

 sequel. It occurred in a bottle of the Challenger collection, from Station 352, near the 

 Cape Verde Islands. I myself examined this species living in the Canary Islands in 

 February 1867, and observed directly its origin and detachment from the polygastric 

 Monophyid Cymba crystallus (compare below, Genus 23). 



1 Cuboides = Cuboidal, x.v$oitln;. 



