REPORT ON THE AMPHIPODA. 487 



1879. ClaUS, C. 



Der Organismus der Phronimiden. Mit. 8 Tafeln. Wien, 1879. 



Following Milne-Edwards, Claus here sets tlie Typhidae or Platyscelidae (Hyperines 

 anormales), distinguished by a marked sexual dimorphism as well as by the zig-zag antennte 

 of the male, over against the Hyperina with normal antennte. In the latter group he 

 arranges, in tliree families, the Phronimidse, Hyperidae and Vibilidas. The VibUidae are 

 easily distinguished by the general form resembling the Gammaridte, the small size of the 

 head and eyes, as well by the short dilated anterior antennae. The border line is less easily 

 marked out between the other two families. He characterises them as follows : — 

 " Hyperidae. Head of considerable size, more or less globular, with large pair of eyes, 

 extending over almost tlio whole surface of the head. The antennaj in both sexes with 

 multiarticulate peduncle, in the female without or with rudimentary, in the male with long 

 multiarticulate, flagellum. Gnathopods frequently armed with weak clasper (Greifhand); 

 the rest of the thoracal-limbs end with simple claw and are formed like one another 

 (Hyperia), those of the fifth (TJiemisto), and sixth pair (Ci/llopu,s, Cystosorna) are sometimes 

 considerably elongated, those of the seventh or last pair only as an exception {Cyllopus) 

 rudimentary. 



" Phronimidae, Head of considerable size, generally with strongly prominent snout, and 

 divided pair of eyes extending over almost the whole surface of the head. The anterior 

 antennae with multiarticulate peduncle, in the female short and without flagellum, in the 

 male long with multiarticulate flagellum. The antennae of the second pair in the male like 

 those of the Hyijeridfe, in the female reduced to the coxal-joint coalescent with the cephalic 

 integument and accompanied by the antennary gland. The thoracal legs partially (principally 

 the fifth pair) armed with powerful chelae (Greifzange), often of dififerent form and size. 

 Elongate backward directed liver-tubes absent from the stomach (am Magendarm fehlen)." 



The Phorcinse, Claus here says, are to be referred to the Typhidae. The Phronimidae he 



subdivides into two subfamDies thus : — 

 "1, Phrosininx. Form of body broad and compact. The three pairs of uropods broad-leaved 

 with fin-like rami. Besides the powerfully developed fifth pair of legs of the perjeon 

 (Primno Gu^r.), generally also the third and fourth pairs {Anchylmnera Edw. = Hie)-acimyx 

 Gu^r.), as well as the sixth (P7trosma Risso = Dacfylocera Latr.) armed with powerful 

 claspers (Greifhand). 



" 2. Phroniminx. Body slender and extended, with the last segment of the peraeon elongate. 

 The three pairs of uropods elongate stiliform, with narrow lanceolate rami Thoracal legs 

 extremely varied, those of the fifth pair [third peraeopods] often armed with broad or more 

 elongate (compound) chelae." 



The genus Phronima, Latr., is thus defined : — 



" Ktirper gestreckt mit stark verjiingtem und langgezogenem Endsegment der Brust, mit drei 

 Paar wohlentwickelter stilformiger Uropoden. Kopf kurz, aber hoch mit sehr verlangerter 

 Scheitelmundaohse. Vorderantennen des Weibohens zweigliedrig. Basalglied des hintern 

 Antennenpaares im weiblichen Geschlecht kuglig gewiilbt und mit kurzer Borste besetzt. 

 Die Mandibeltaster fehlen auch dem Miinnchen. TJnterlippe (Maxillarfusspaar) stark 

 comprimirt, mit lanzetformig zugespitzten Laden und conischer Zunge. Die beiden 

 Gnathopodenpaare schmiichtig, mit schwacher zusammengesetzter Greifhand, fiinftes 

 Beinpaar mit miichtiger (zusammengesetzter) Scheerenhand bewafihet. Drei Paare von 

 Kiemenschlauchen am 4., 5. u. 6. Thoracal segment." 



PhronimeUa, Cls., is thus defined : — 



" Kdrper sehr gestreckt, iiberaus pellucid, mit nur 2 Paar stilformiger Uropoden. Kopf kurz, 



