REPORT ON THE ACTINIARIA. 17 



Lave been termed, — I do not know for what reason, — tentacles. The tentacles are 

 arranged in three rows, and more than 200 are jjresent. The endodermal sphincter 

 is extraordinarily strongly developed, in the form of a ridge projecting into the 

 coelenteron. 



Faimily 5, PARACTiDiE. 

 Genus Dysactis, Milne-Edwards. 



Dysactis crassicornis, E. Hertwig. 



Two additional examples of this Actinian, have reached me, dredged from a depth 

 of 55 fathoms at Station 313. One had died in an expanded condition, so that the 

 tentacles were in better preservation than in the specimens previously studied ; from 

 this 1 am enabled to determine some further characters of these oro-ans. 



In many cases terminal pores, which I was before unable to discover, were easily 

 recognised on a surftice view ; I have therefore re-investigated the older material, and 

 was able with some trouble to prove the existence of openings by injecting air into 

 them under water. 



Further, in the well-preserved tentacles, comes strongly into view a characteristic 

 which I had previously figured (former Report, pi. vii. fig. 12), but had not introduced 

 into the text ; the tentacles are longitudinal!}^ striated, so covered with longitudinal 

 ridges and furrows as to recall a fluted pillar ; in section this is still more prominent. 

 At tolerably regular intervals the mesogloea rises in high ridges {PI. II. figs. 6, 7), 

 and at these points the mass of muscle lying in it is correspondingly increased. 

 The muscles therefore form in transverse section a continuous ring, which in the 

 region of the ridges of mesogloea is drawn out into cusps. At the base of an especially 

 strong tentacle I counted twenty-two longitudinal ridges, of which, however, some uul}- 

 reach to the tip. 



Family 6, Liponemid-e, R. Hertwig. 



Genus Liponema, R. Hertwig. 



Liponemidse with weak endodermal sphincter; the body-wall marked by longi- 

 tudinal furrows, without marginal spherules ; stomidia very numerous. 



Liponema multiporum, R. Hertwig (PI. I. fig. 13, PI. II. fig. 4). 



Stomidia, several hundreds in number, distributed in several cycles, and scattered 

 over the whole oral disc ; body apparently cup-shaped, broadening out from the small 

 pedal disc upwards to the wide oral disc. 



Habitat. — (a) Station 305, January 1, 187G ; 120 fiithoms. One specimen. 



(6) Station 147, December 3, 1873 ; IGOO fiithoms. One specimen. 



(ZOOU CHALL, KXr. — PART L.XXUl. — 1SS8.) Dddd 3 



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