254 T. A. STEPHENSON 



Prntactinia, Carlgr., 11)00, p. IKir.. 



Halcampidao with body which iiiuy Im- long, juid pliysa. Scapus 

 with jjapillae to wliicli fiagnuiitH may adheix-. 'JViitacles typically 

 twenty, theii' longitudinal musculature ectodermal. No isphincter. 

 Ten niacrocneines present — the ' Edward«ia eight ' + one couple pairing 

 with the doi'solateral protocnemcs. The wixth primary c-ouple repre- 

 sented by two perfect but weak mesenteries. Four pairs of inicro- 

 cnemcs, confined to distal part of body. 



Species : 

 P. californica, Carlgr., 1900, p. 11G6. 



ScYTOPHORUS, Heriw., ISHi, ]>. 104. 



Halcampidae with body which may be long, with cuticle deveioix-d 

 chieHy on the scapus. The physal end may attach itself. No venucae. 

 Tentacles fourteen, their longitudinal ?nusculature ectodermal. Mesen- 

 teries fourteen, the usual primary six })airs-f one couj^le, the individuals 

 of the couple with their retractors facing one pair of directives. All 

 these mesenteries are macrocnemes, but some may be without gonads. 

 No sphincter. The ciliated tracts of the filaments may be peculiar. 

 Species : 



8. striatus, Hertw., 1882, p. 104. 



S. antarcticus, Pfeff., 1889, p. 11. (See Carlgren, 1899, p. 7.) 



Family 2. Ilyanthidae. Gosse. 



Iljaiithidae as used by Gosse, 1860, pro parte, i.e. 

 excluding Cerianlharia, Edwardsiaria, and Halcampids. 



Athenaria often attaining a fair size, frequently with stout bodies 

 which are often capable of becoming vermiform. Suckers present or 

 absent. Ciiiclides may occur in the phj^a or on the scapus. Patches 

 of cuticle are sometimes present. Tentacles .simple or capitate, eight, 

 twelve, twenty, or more, up to about forty. Sphincter absent or sliglit 

 and endodermal. Never fewer than ten pairs of mesenteries in adult 

 animals, the number varying up to about eighteen pairs. They are 

 usually all macrocnemes, even if there is some distinction among them, 

 though in Peachia four at least of the ten pairs are imperfect and 

 without gonad or filament, but they have strong retractors and cannot 

 be called microcnemes. There is often only one siphonoglyphe, and this 

 may bear a specialized upper end or conchula. 



Genera: Ilyanthus, Eloactis, Haloclava, 

 H a r e 11 a c t i s . Peachia. 



Polyopis striata, Hertw.. may just possibly have been 

 a battered member of this famil3^ 



