530 MH. H. FAEQUHAE OK SOME 



Halcampactis, n. g. 



Hexamerous actiuians with acontia; aboral end of the body 

 rounded, without pedal disc; body divided into three parts, 

 capitulum, scapus, and physa; capitulutn retractile; body 

 furnished with suckers; no sharply-defined circular miiscle; 

 six pairs of strongly-developed, perfect mesenteries ; secondary 

 mesenteries probably always present ; tentacles few, conico- 

 cylin^drical. 



Halcampactis mirabilis, n. sp. (PL 36, figs. 4-6.) 



Body cylindro-clavate, exceedingly variable, divided into 

 capitulum, scapus, and physa ; body-wall smooth in expansion, 

 transversely and longitudinally wrinkled when contracted ; 

 studded with exceedingly minute suckers. Disc flat, with slight 

 corrugations from the bases of the inner tentacles to the mouth ; 

 radii distinct. Mouth linear, not prominent, but often gaping. 

 Throat strongly ribbed. Tentacles cylindrical, with rounded 

 extremities, bicyclic, 24 (12-M2), those within slightly larger 

 than those without, often recurved in extension. Acontia 

 emitted rarely, and by the mouth only. Scapus and physa 

 brownish red or yellowish red, rarely dusky brown ; capitulum 

 pale yellow or crimson. Disc buff or pale yellow, with twelve 

 patches of madder-brown round the mouth betw^een the radii, 

 and sometimes sulphur -jellow spots near the bases of the 

 tentacles. Tentacles pale yellow, with four or five dark brown 

 or sulphur-yellow spots formed by pigment-cells which line the 

 interior tube ; when the tentacles are partly contracted, this 

 colour appears to line the whole interior. ffisophagus rich 

 orange. Length of physa and scapus together about 26 mm. ; 

 diameter of physa 7 mm. ; diameter of scapus about 4 mm. ; 

 length of capitulum 2 mm. ; diameter of disc 4*5 mm. ; length 

 of tentacles 3 mm. 



Hah. Ohiro Bay and adjacent coast, near "Wellington ; on 

 roots of Lessonia and undersides of stones, below low-water 

 mark ; abundant. 



This species has no well-defined line between the scapus and 

 bladder-like physa ; the capitulum, however, is better defined, 

 being separated from the scapus by a slight constriction and 

 usually by an irregular band of dark colour. A constriction 



