202 D. Echinodermata. 



rather large. Month ventral, at a greater distance from the foremost extremity 

 of the body. Anus posterior, dorsal, usually almost terminal. Tentacles 12 (?) 

 to 20. Pedicels arranged in a single row round the brim of the body and in a 

 double one along the odd ambulacrum. The dorsal surface seldom naked, com- 

 monly with a greater or smaller number of retractile or non-retractile, more or 

 less inconsiderable processes, arranged in a single row all along each ambulacrum 

 or in an irregular double row, or scattered over the lateral interambulacra. 

 Theel ( 7<J ); hierher: papillifem n. 128'S., 14510'0., 1400 Fad.; 3342'S., 

 78 18'W., 1375 Fad.; 033'S., 15134'W., 2425 Fad. - - typica n. 3547' 

 N., 823'W., 1090 Fad. sangumolenta n. 347'S., 7356'W., 2225 Fad.; 



38 7' S., 94 4' W., 1500 Fad. - var. marginata n. 50 1' 8., 123 4' 0., 

 1800 Fad. ; 42 42' S., 134 10' 0., 2600 Fad. abyssicola n. 34 7' 8., 



73 56' W., 2225 Fad. - - sordida n. 62 26' S., 95 44' 0., 1975 Fad.; 53 

 55' S., 108 35' 0., 1950 Fad.; 50 1' S., 123 4' 0., 1800 Fad.; 34 7' S., 

 73 56' W., 2225 Fad. mamillifera n. 38 7' S., 94 4' W., 1500 Fad.; 

 34 7' S., 73 56' W., 2225 Fad.; 33 31' S., 74 43' W., 2160 Fad. - - selen- 

 kianan. 725'S., 15215'W., 2750 Fad. 



Deimatidae n. fam. Body usually rather long, cylindrical or fusiform, seldom 

 shorter and of an elliptical form. Tentacles 15 or 20. Mouth almost terminal, 

 though more or less distinctly turned towards the ventral surface. The lateral 

 ambulacra of the ventral surface bearing very long and wide , cylindrical or 

 conical, slightly retractile pedicels, disposed either in a single or a double row 

 along each side of that surface, and sometimes provided with another series of 

 extremely elongated, conical, non-retractile processes placed externally and above 

 the pedicels. The odd ambulacrum generally naked, seldom with a few rudimen- 

 tary pedicels or with a double row of rather larger ones. The dorsal surface with 

 very long, elongated, conical, mostly non-retractile processes, disposed in one or 

 more rows all along each of its ambulacra. Calcareous deposits: perforated plates, 

 spicula. wheels, cruciform and dichotomously branched bodies. Calcareous ring 

 composed of a rather fragile and imperfect net-work ; no distinct radial or inter- 

 radial pieces. Theel ( 7<J ). 



tibersicht der Gattnngen der Deimatiden. 



I. Integument mostly rather hard, strengthened by numerous perforated cal- 

 careous plates, often crowded and forming a skeleton ; tentacles twenty. 

 A. Tentacles small , retractile. Pedicels of the ventral lateral ambulacra 

 in a single row. 1. Deima. B. Tentacles large, not retractile. Pedicels of 

 the ventral lateral ambulacra in a double row. 2. Oneirophanta. 

 II. Integument pliable, strengthened by scattered spinose spicula; tentacles 20. 



3. Orphnurgus. 



III. Integument very pliable, containing wheels along with spicula, cruciform 

 bodies, or dichotomously branched deposits. A. Tentacles 20; odd ambu- 

 lacrum with a double row of pedicels. 4. Pannychia. B. Tentacles 15; odd 

 ambulacrum naked, a. Dorsal processes very long, disposed in a single row 

 along each ambulacrum. 5. Laetmogone. b. Dorsal processes shorter, dis- 

 posed in several rows along each ambulacrum. 6. Ilyodaemon. 



Elpidiidae n. fam. Body varying greatly in shape from very long, cylindrical, 

 and <S'ynap to-shaped, to rather short, almost globular, or strongly depressed, 

 nearly flat; tentacles as a rule 10, in a few form 11 to 12 or 20 ; mouth seldom 

 completely ventral, usually almost terminal, though more or less distinctly turned 

 towards the ventral surface ; the lateral ambulacra of the ventral surface bearing 



