Materials for a Carcinological Fauna of India. No. 5, The Brachyura 
Primigenia, ov Dromiacea. By A. Aucock, M.B., C.M.Z.S., Superin- 
tendent of the Indian Museunv. 
[Received lst September ; Read 1st November, 1899, | 
The opinions adopted in this paper are those of Boas, that the 
Dromiucea are Brachyura ; and of Bouvier, that they connect the higher 
Brachyura with the Homarid family of Macrura. 
I have endeavoured to show that the Dromiacea, or Brachyura 
Primigenia, include two natural groups—Dromtidea and Homolidea— 
each of which is a collection of families equivalent to the collections of 
families recognized as Catometopa, Cyclometopa, etc.; but, as is only to 
be expected in dealing with primitive groups, the families are small. 
After raising a family to the rank of a tribe, and splitting it up 
into several independent families, it may seem inconsistent to unite the 
recognized genera of other authors, as is done in this paper with the 
genera Dromia, Dromidia, Cryptodronvia, and Petalomera, all of which 
are treated as sub-genera of Dromia. But the reason for this treatment 
is that these are all linked together by intermediate forms. 
The Indian species of Dromiacea number 28 and belong to the 
following genera and families :— 
| Homolodromidee :—Arachnodromia (? = Homolodromia). 
Dromupea 4 Dynomenidz :—Dynomene, Acanthodromia. 
( Dromiide :—Dromia (Dromidia, Cryptodromia, Petalomera), 
Pseudodromia, Conchoecetes, Sphaerodromia. 
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