INVERTEBRATA, CRYPTOGAMIA, MICROSCOPY, ETC. 273 



the Medusae, with four orders and sixteen families. We here add to 

 the names of these the numbers of genera (in brackets) and species 

 referred to each. 



Anthomedus^ (50) 125 sp. 



Codonidfe (14) 44 sp., Tiaridaa (13) 30 sp., Margelidae (16) 40 

 sp., Cladouemida) (7) 11 sp. 



LEPTOMEDUSiE (61) 140 Sp. 



Thaumantida3(ll) 20 sp., Cannotidse (15) 25 sp., Eucopidae (24) 

 60 sp., MquoridiB (11) 35 sp. 

 Trachomedus^ (26) 60 sp. 



Petasidae (7) 10 sp., Trachynemidfe (6) 14 sp,, Aglaurida3 (5) 

 13 sj)., Geryonidfe (8) 23 sp. 

 Narcomedus^ (23) 75 sp. 



Cunanthidge (6) 22 sp., PeganthidsB (4) 16 sp., iEginidse (8) 

 16 sp., Solmarida3 (5) 21 sj?. 



All the families except Cunanthidai and PeganthidsB are divided 

 into subfamilies, of which there are 40. Of the genera, 20 are 

 broken up into (45) subgenera. 



Of the 160 genera and 400 species of Craspedota which, as shown 

 above, Haeckel defines, 83 genera and 148 species are new. Of the 

 new species, 58 are placed in (42) quite new genera, 37 in (27) 

 other new genera which also contain 45 old species, while 53 are 

 left in (40) old genera together with 90 recognized species. There 

 is a third category of (14) new genera for 21 old species exclusively. 

 Lastly, 37 old genera include ouly 96 admitted species. 



From his ' Prodromus,' dated 1877, Haeckel quotes his own names 

 for 125 species. In fifty-seven cases he now substitutes the generic for 

 the subgeneric name, changing also the specific name in three of these. 

 Generic names only are changed in fifty-six instances, specific only in 

 five, both in four. Only three of the species thus cited retain names 

 quite unchanged. We do not refer to mere grammatical alterations, 

 which are very numerous. From synonyms in the text it might bo 

 thought that five species * were wrongly named in the Atlas, but on 

 consulting the latter we find the right names of these species in the 

 copy before us. 



The Atlas has 233 figures, on 20 plates, representing wholly or in 

 part 104 species, of which 80 are new. The figures of old species 

 include, among others, those of seven Medusa), first described by the 

 author in the Jena Journal for 1864. Most conspicuous of these is 

 Mttrocoma Aiiiur, the only species to which an cntii'e plate is devoted. 

 Only six plates are coloured, to speak correctly, for tlie figures of 

 fourteen others are either uniformly tinted or appear pale on a coloured 

 ground. In the text, references are omitted to the figures of Sarsia 

 cximia, Thamnontoma macrostomn, JEqnorca dixcus, Ciiuina 7'i(hi(jiiiot<a, 

 and Palyxenia cyanoshjlis. Ctenaria is figured, f 



As to the 68 new species not here figured, wo arc promised fuller 



♦ Mclicertissa claviijera, Polycanna (2 sp.), Marmanema claviffcnim^ and Rhapa- 

 lonema civrulcum. There nro a few otlier triflinj; errors of reference, 

 t See tliis Journal, ii. (18711), p. SDO. 

 VOL. Ill, T 



