ENTOMOSTRACA OF MINNESOTA. 205 



W. Schmankewitsch described as new D. degenerata and D. rudis, 

 from salt or brackish waters. These he regards as degenerate forms 

 produced by the inferior aeration of dense waters. The author does 

 not appear to recognize the modern distinctions of genera, so that, not 

 having seen the work, even the generic position cannot be definitely 

 stated. His investigations seem to show that the proximity of salt 

 waters influence the form of the body, or, perhaps, that there is a con- 

 stant interchange between the sub marine and fresh-water species. 

 Daplmia brevicauda Chambers is an incorrectly figured and described 

 8i7nocephalus. 



Daplinia bolivari Richard. 

 Richard '88. 



"Caput a latera visum fere triangulare, latum, margins superiore recto; anteriore 

 cum inferiore lineam usque ad apicem rostri ajqualiter ac leviter arcuatam formante; 

 rostro acuto brevi. Testa cetera margine dorsali subrecto inter caput et corpus leviter 

 rinuato, margine ventrali aculeato parum arcuato. Spina testae longa aculeis multis 

 ac validis oruata. In capite a latere vise linea circularis patet insignis distinctissime 

 serie duplo aculeorum acutorum instructa, parte superiore modo la^vi. Ad apice 

 dorsali et posteriore hugus linea? sequitur linea alia eadem structura marginem supe- 

 riorem testse usque ad apicem caudalis spinas. Adest preterea linea alia in medis 

 utriusque lateris teslre, aculeis ornata. Antennae Imi paris magnre. 2di paris medi- 

 ocres piliis brevibus sed distinctissimis ornatse. Setae abdominales mediocres, ad 

 apicem ciliis longis dense obsitae. Oculus mediocris crystallinis paucis perspicuis; 

 macula ocularis rotunda, parva. Longit. fern, spina testae inclusa, 3.35 mm., spine, 

 0.8 mm." 



This Spanish species is not sufficiently described to be allotted to 

 its place among its congeners. The armature of the abdomen is abso- 

 lutely essential. 



Daplinia cariiiata King. 

 King '52-54. 



This form, though incompletely described, will be easily recognized 

 when rediscovered. It belongs to the D. seech feri group and is said to 

 resemble J>. si7niUs Glaus, being one of the largest of the genus. The 

 head is armed with a crest but is depressed and uniformly rounded. 

 The shell is oval with a long spine from the upper angle in the young 

 female. Abdominal processes thick. Post-abdomen attenuated. De- 

 tails of armature not given. Ephippium with four eggs. The eye is 

 somewhat distant from the margin. 



Daphnia gravis Schoedler seems to us but an extreme variation of 

 the above as it was regarded by King. 



Daphnia Mngii Schoedler is a very large species with the head 

 greatly helmeted. The outline is nearly circular and rises above the 

 level of the back. The shell is oval with an extremely long spine 

 which is directed obliquely dorsad. 



