REPORT ON THE SIPHONOPHOR^E. 109 



Genus 11b. Cucubalus, 1 Quoy et Gaimard, 1824 (MS.). 

 Cucubalus, Blainville, Manuel d'Actinologie, 1834, p. 130. 



Definition. — Eudoxidse with a conical, spathiform or cordiform bract, obliquely 

 bevelled on the ventral side, evenly convex on the smooth dorsal side, pointed at the 

 apex. Phyllocyst simple, ovate. (Eudoxise of the genus Muggisea.) 



The genus Cucubalus was founded by Quoy and Gaimard (2. pi. iv. figs. 24, 27) upon 

 a Eudoxia from the Tropical Pacific, which Blainville afterwards described as Cucubalus 

 cordiformis (24, p. 130). It may be, perhaps, the monogastric generation of Muggisea 

 chamissonis ( = Diplujes chamissonis, Huxley, 9, pi. i. fig. 3). The best known 

 representative of the genus is the Mediterranean Cucubalus eschscholtzii, which was 

 described by Busch as Eudoxia eschscholtzii. 2 Its development from the polygastric 

 Muggisea kochii, and the regular metagenesis of these two forms, were afterwards 

 described very accurately by Chun (86, 87). A similar and nearly allied species 

 was observed by me in 1866 in the Canary Island, Lanzerote, and I found it again in 

 some bottles from the Challenger collection taken in the Tropical Atlantic (Stations 

 348, 352). This Atlantic species may retain the name of Cucubalus pyramidalis, and 

 its polygastric generation Muggi&a pyramidalis, with respect to the original names of 

 Busch and Will (compare Chun, 85). 



The genus Cucubalus is closely allied to the following Cucullus, the monogastric 

 generation of Diphyes. It differs from the latter in the smooth and edgeless shape of 

 the bract, which is more rounded and not pyramidal. 



Genus 12. Cucidlus, 3 Quoy et Gaimard, 1824 (MS.). 



Cucullus, Blainville, Manuel d'Actinologie, 1834, p. 131. 



Definition. — Eudoxidse with a cowled or cucullate, sometimes three-sided pyramidal 

 bract, open at the bevelled ventral side, evenly convex, or sometimes with three incom- 

 plete edges on the dorsal side, pointed at the apex. Phyllocyst simple and conical. 

 (Eiidoxige of the genus Diphyes.) 



The genus Cucullus contains those monogastric Eudoxidaa which arise from the 

 polygastric genus Diphyes, in the restricted sense in which recent authors have employed 

 it, and which we have accepted. The bract is irregularly conical, or pyramidal, with 

 a deep ventral fissure, which passes into the obliquely truncated cavity. Its dorsal face 

 is either evenly convex, or slightly three-sided, its apex pointed. The inferior half 

 of the spathiform bract embraces the included siphon and gonophore like a mantle, and 



1 Ci«:w&aZMS= Name of a plant. ! 67, p. 33, Taf. iv. figs. 7-10 ; and Taf. v. figs. 1-9. 



3 Cucullus = Cowl. 



