ELLOBIOPSIDAE 285 



191 1 rt, b). Genus Staphyhcystis, type Ellobiopsis racemostis Coutiere; genus Ellobiocystis, type Ello- 

 biopsis caridariim Coutiere. The author distinguishes the following species: 



Staphyhcystis racemosus, on the ventral surface of the third abdominal segment of Pasiphaea tarda 

 Kroyer, from St. 1038 of the cruises of the ' Princesse-Alice ', north-east of Iceland, 3310 m. Ac- 

 cording to Coutiere the parasite described by Bate on P. cristata Bate from the Fiji Islands belongs to 

 this species. 



In the genus Ellobiocystis Coutiere recognizes a number of species. The hosts were collected during 

 the cruises of the ' Princesse-Alice ' in the region of the Bay of Biscay to the Azores from depths 

 up to 5000 m. (except E. mysidariim). The species chiefly occur on the mouthparts and the maxillipedes 

 of the hosts. The names given by Coutiere are : 



Ellobiocystis caridariim, on Acanthephyra purpurea A.M.E., A. pulchra A.M.E. and Systellaspis 

 debilis (A.M.E.). 

 Ellobiocystis villosus (forme y of 191 iZ)), on Acanthephyra purpurea A.M.E. 

 Ellobiocystis tuberosus (forme 7/ of 191 iZ>), on Acanthephyra purpurea A.M.E. 

 Ellobiocystis filicollis (forme j] of 191 1 b), on Acanthephyra purpurea A.M.E. 

 Ellobiocystis catenatus (forme e partim of 191 iZ)), on Acanthephyra purpurea A.M.E. 

 Ellobiocystis tenuis (forme e partim of 191 16), on Pasiphaea sivado (Risso). 



Ellobiocystis mysidarum, on Antarctomysis maxima (H. J. Hansen, MS. in Holt and Tattersall) from 

 the Antarctic (the French Antarctic Expedition of the 'Pourquoi-Pas?'). 



Finally, Coutiere mentions small parasites of Sergestes sp., from the cruises of the' Princesse-Alice', 

 in all probability belonging to Ellobiocystis caridariim. 



CauUery (1912). Short note on the particulars and the systematic position of Ellobiopsis chattoni, 

 abstract of a paper read at the Congress of Zoology of 1910. 



Liihe (1912). In the discussion following the paper by CauUery, Liihe remarked that he had found 

 on the gills of a Unionid parasites which were extraordinarily similar to those described by CauUery. 

 No further data being available, it is impossible to decide whether or not these parasites belonged to 

 the EUobiopsidae. 



CoUin (1913). Description oi Parallobiopsis coutieri, parasite oi Nebalia bipes (O. Fabr.). The parasite 

 is attached to the abdominal appendages, the gills, and especially to the membranous folds of the 

 cephalothorax of the host. It is fixed to the chitin by a circular sucker, and according to Collin it has 

 no root system ('il n'emet point de rhizoides'). In young stages the body already shows a transverse 

 septum ; in older stages up to nine successive gonomeres may be observed, and the topmost may show 

 the remnants of a former gonomere from which the spores have escaped. 



Chatton (1920). This extensive paper was completed in May 1914; it gives, besides data on real 

 parasitic Peridinea, the most important particulars of the EUobiopsidae. Concerning the species 

 distinguished by Coutiere in his genus Ellobiocystis, Chatton remarks that a specimen of E. caridariim 

 (Coutiere, 1911c, pi. viii, fig. 18) in its lower half shows hairs, as they occur as a specific character in 

 E. villosus. This causes some doubt concerning the specific status of the various forms. 



Willey (1920). Figure and notes of a 'two-chambered cyst' attached to the right antenna of 

 a female of Pseudocalanus elongatiis (Boeck) from CoUinson point (Camden bay), Arctic Alaska, 1-2 

 fathoms, similar to the parasites observed by Scott (1897), now named Ellobiopsis chattoni CauUery. 

 In the trophomere and in the gonomere a faint indication of a radial arrangement of the contents was 

 observed. The shape of Willey 's specimen differs from CauUery's specimens of E. chattofii in so far as 

 the more or less conical trophomere is much larger than the globular gonomere. 



Zachs (1923). Description and figure of E. (?) eupraxiae on the parapodia of the Polychaete worm 

 Nephthys ciliata Miiller from the White Sea. The parasite consists of an elongately oval trophomere and 



