REPORT ON THE ACTINIARIA. 29 



Throe specimens. (cZ) Station 14'J J, uft' Cumbeihuul l];iy, January 29, 1874; 105 

 fathoms. Three specimens, (e) Station 149 H, off Cumberland Bay ; January 29, 1874 ; 

 127 fathoms. One specimen. 



Dimensions. — Length, r5-2'5 cm. ; greatest breadth, 07-rO cm. 



On an external inspection I was inclined to identify this species with Ilalcampa 

 clavus, which it strongly resembles. The preparation of transverse sections, however, 

 caused me to abandon this view, and a more accurate study produced a number of 

 points of divergence, which I will briefly enumerate. 



1. The tentacles, though twelve are also present in this species, are essentially 

 longer than in the other, and end in a fine point. The two longitudinal furrows which 

 occur ou them in Halcampa clavus, can be recognised neither superficially nor in 

 transverse section. 



2. The circular muscles of the body-wall are weakly developed ; the laminie which 

 they form are not so striking as in Halcampa clavus; and they project into the 

 coelenteron at greater distances from each other. The sphincter-like enlargement of 

 the circular muscle-layer is wanting. 



3. On the stomatodseum the marked projections, which designate the insertions of 

 the mesenteries, are absent. 



4. In the mesenteries the muscle-lamina is pleated in a most complicated manner, 

 so that in transverse section it exhibits an abundant arborescence. The centre of the 

 muscle forms a sort of tree (PL 11. fig. 5), a thin lamina starting outwards from the 

 mesentery, and branching like the top of a tree. This whole region is usually marked 

 ofi" by an indentation from the adjacent parts, the mass of muscle being thus divided 

 into three sections. 



Genus Halcampella, Angelo Andres. 



Ilyanthidse with six powerfully developed pairs of mesenteries, but with numerous 

 rudimentary mesenteries, and numerous tentacles. 



Halcampella maxima* n. sp. 



Tentacles small, approximately 4G ; body devoid of longitudinal furrows ; its 

 surface partly bark-like, partly somewhat incrusted ; the polyp of considerable size. 



Habitat.— ^taiiow 209, Zebu, Philippine Islands, January 22, 1875 ; 95 fathoms. 

 Six specimens. 



Dimensions. — Length, 8-15 cm. ; greatest breadth, 2-3 cm. ; breadth at narrowest 

 point (near the pedal disc), 0"4-r2 cm. 



In all the specimens the body is a lax thin-walled sack ; its diameter is least at the 

 posterior end, w^hich is stalk-Uke and rounded ofi", but anteriorly it bellies out, contract- 

 in o- a wain in the region of the oral disc. With the exception of the largest, all the 



