498 RADIATA. ACALEPHA. Actinea. 



42. A senilis. — Body rough, with numerous rows of glandu- 

 lar M'arts, tentacula shorter than the body. 



Hydra disciflora, tentaculis retractilibus subdiaphanis ; corpore cylin- 

 drico, miliaribus glandulis longitudinaliter striate, Gaert. PIiiL Trans. 



1701, 82. t. i. f. 4 A. senilis, Lhm. Syst. i. 1088. Dicq. Phil, Trans. 



1773, 866. t. kvi. f. 10.— A. verrucosa, Pe7in. Brit. Zool. iv. 49.— A. 



crassicornis, Adains, Linn. Trans, iii. 252 — ^A. equina, Sower. Brit. 



• JVlisc t. 4. — A. gemmacea, equina and crassicornis, Turt. Brit. Fauna, 



130, 131 A. crassicornis, Stewarfs £1. i. 393 — In crevices of rocks 



and sand, common. 

 Body reddish, the tips of the glands pale, the glands themselves are dis- 

 posed in vertical and transverse rows, to which adhere fragments of rock 

 and shells ; the feelers are numerous, conical, or lengthened, and variously 

 annulated or variegated with white and red. 



43. A. sulcata. — Body longitudinally sulcated, the tentacula 

 exceeding its length. 



Hydra tentaculis denudatis, numerosissimis ; corpore longitudinaliter 

 sulcato, Gaert. Phil. Trans. I76I, 78. t. i. f. 1 — A. sul. Penn. Brit. 

 iiool. iv. 48 — A. maculata, Adams, Linn. Trans, v. 8 — A. cereus, 

 Turt. Brit. Fauna, 131 — A. sul. Stetvarfs El. i. 394 Rocks of Corn- 

 wall. 

 Body smooth, of a chesnut colour, the margin of the oral disc dentated ; 

 the tentacula, which the animal cannot wholly withdraw, are greenish, with 

 a red tip, nearly 200 in number, and greatly exceed the body in length. 



44. A. pechmculata. — Body lengthened, the lower part nar- 

 row, smooth, the upper enlarged, and glandularly warty ; oral 

 disc expanded, lobed ; tentacula in several rows, variegated. 



Hydra calyciflora, tentaculis retractilibus variegatis, corpore verrucoso, 

 Gaert. Phil. Trans. I76I, 79. t. i. f. 2 — A. ped. Penn. Brit. Zool. \v. 

 49 — A. bellis, Turt, Brit. Fauna, 131 — A. plumosa, Stetoarfs El. i. 

 394 — Southern coast of England. 

 Stalk cylindric, body suborbicular, of a brown colour, with fragments of 

 shells adhering to the warts ; tentacula unequal, those nearest the mouth 

 longest, variegated ; a spotted space round the mouth variegated. A grega- 

 rious species. 



45. A. dianthus. — Body cylindrical, oral disc expanded, five 

 lobed imbricated, Avith short tentacula. 



Ellis, Phil. Trans. 1767, 436. t. xix. f. 8 A. pentapetala, Penn. Brit. 



Zool. iv. 50 A. senilis, Adains, Lin. Trans, v. 9 — A. dianthus, Turt. 



Brit. Fauna, 131. Stewart, El. i. 394 — Gregarious in pools near low- 

 water mark. 

 Body soft, pale bluish-white, diaphanous, with whitish veins, and nume- 

 rous pores ; oral disc lobed at the pleasure of the animal, covered with short 

 narrow flat tentacula ; mouth deeply striated, four of the striae on one side 

 more deeply seated, forming prominent ridges. 



46. A. intest'malis. — Body cylindrical, the upper half sud- 

 denly contracted, and narrow.' 



Fab. Fauna Groen. 351. t. i. f. 11. — Adheres to roCks at low-water mark, 

 Zetland. 

 When contracted, the body seems like two broad rings, of nearly equal 

 breadth, and about half an inch in diameter ; when expanded to nearly two 



