REPORT ON THE ACTINIARIA. 29 



Three specimens, (d) Station 149 J, off Cumberland Bay, 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, 0"7-l"0 cm. 



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

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

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

 j)oints 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 on 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 laminae which 

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

 coelenteron at greater distances from each other. The sphincterdike enlargement of 

 the circular muscledayer is wanting. 



3. On the stomatodeeum 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 (PI. II. fig. 5), a thin lamina starting outwards from the 

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

 off by an indentation from the adjacent parts, the mass of muscle being thus di\"ided 

 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 46 ; body devoid of longitudinal furrows ; its 

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



Habitat. — Station 209, Zebu, Philippine Islands, January 22, 1875 ; 100 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 bod)^ is a lax tin n- walled sack ; its diameter is least at the 

 posterior end, which is stalk-like and rounded off, but anteriorly it bellies out, contract- 

 ing again in the region of the oral disc. With the exception of the lai-gest, all the 



