22 ACTINIARIA 



size of the animal, very strong, seems to indicate that we have to do with an Ilyanthid. In another paper 

 I will give a more complete description of the genus than that given by Mc. Murrich. 



The new genus Parahalcampa from the Antarctic, of which I cannot give a full description here, I 

 characterize as follows: 



Halcampidae with elongated body. Column not divisible into regions, without cuticle and "Halcam- 

 papapillae". Proximal end physa-shaped, penetrated by apertures. The most distal part of the column with 

 spirocysts. Sphincter as in Hal camp a. Tentacles lo, thick and short. A single weak siphonoglyphe. Number 

 of mesenteries io + lo. The lo first (the "Edwardsia-mesenteries" + the fifth couple) perfect, fertile and with 

 strong, longitudinal pennons and filaments. The lo others (the sixth couple + the dorsolateral and lateral 

 mesenteries of the second order) imperfect, sterile, weak, without longitudinal pennons and filaments, in the 

 whole length of the body. Type P. antarctica n. sp. 



Family Edicardsiidac. 

 Diagnosis: Athenaria with elongated body, divisible into two or commonly into three regions, witliout 

 sphincter or acontia. Tentacles always present. 8 perfect and fertile mesenteries. Two opposite pairs, the 

 longitudinal muscles of each turning away from each other, forming the two directive pairs of mesenteries, and 

 between these on each side 2 mesenteries with the longitudinal pennons turning towards the ventral directive. 

 Four to several weak and very short mesenteries in the uppermost part of the column, always without filaments 

 and reproductive organs. Ciliated streaks always present, sometimes discontinuous. 



Owing to the presence or absence of nemathybomes (Nesselhockerkapseln) and to the occurrence of 

 two different types in the arrangement of the tentacles I have (1900) divided this family into two subfamilies, 

 Edwardsiinae and Milne-edwardsiinae, corresponding to my families Edwardsiidae and Milne-edwardsiidae 

 (1893) — a division which I will provisionally keep, though it is possibly a question, if it would not be more 

 correct to place the Edwardsiinae together with Peachia, Haloclava and Eloactis in a family, and the Milne- 

 edwardsiinae together with the family Halcampoididae (compare above p. 20). 



To the former subfamily the genera Edwardsia (inch Edwardsiella and Edwardsioides) and Isoedwardsia 

 belong, to the latter Milne-edwardsia and Paraedwardsia. 



The generally very elongated body-wall is divisible into two or three regions, as it is often the case 

 in the Athenaria.. The most distal part, capitulum, is always present, but comparatively short. It is de\-oid 

 of a cuticle and provided with 8 longitudinal furrows, corresponding to the insertions of the mesenteries. 

 These furrows are more or less distinct, the most conspicuous in the genus Milne-edwardsia, especially in M. 

 carnea and still more in M. loveni, in which the capitulum has a decidedly polygonal appearance. The other 

 part of the column is formed either wholly by the scapus, provided with a cuticle, or by a more or less deve- 

 loped physa, commonly ampuUaceous and devoid of cuticle, added to the most aboral part of the column. 



The physa is the most distinct in the genus Edwardsia, while in the genera Milne-edwardsia and Para- 

 edwardsia it is either lacking or not well-developed. In the genus Isoedwardsia there is never any physa, but 

 the most aboral part shows the same structure as the scapus. Transverse sections through the most aboral 



