MUSEUM OF COMPARATIVE ZOOLOGY. 51 



we may look for high spired Natica-like types, for representatives of 

 Acteonella, Avellana, and the like; for small Volutoids of the tertiary 

 and cretaceous type?, for Rostellarias, even for Nerineas, and more 

 particularly for forms intermediate between Firula and Cyprea. Among 

 Acephala I would expect a variety of Myacea approaching those 1 de- 

 scribed in my monographs of that family from the Jurassic and cre- 

 taceous formations, such as Ceromya, Corimya, Circomya, Goniomya, 

 Myopsis, etc., with Panorpa and Pholadomya, and others recalling per- 

 haps also Cardinia, Gresslya, or Cardiacea more closely related to Cono- 

 cardium than the living species, perhaps leading to Opis, or Trigonue 

 of extinct types akin to Myophoria, with Pachymya, Diceras Gram- 

 misia, Inoceramus, Pterinea, Monotis, and Posidonia. Kudistcs should 

 take the place of oysters, and the harvest of Bz'achiopods should bo 

 large. 



Among Crustacea it is natural to suppose that genera may be dis- 

 covered reminding us of Eryon or of Pemphyx Gampsonyx, or some 

 Amphipods, and Isopods aping still more closely the Trilobites than 

 Scrolls, or Limuloids approaching that extinct family. The classifica- 

 tion, embryology, and order of succession of Echinoderras is now so 

 veil known, that it is perhaps still more easy to anticipate the char- 

 acter of discoveries in this branch of the animal kingdom than in any 

 other. I expect confidently, to find Spatangoids approaching Holaster, 

 Toxaster, Ananchytes, Ilemipneustes or Metaporbinus, and others akin 

 to Eysaster, Echinolamps approaching Pygurus, Xacleolites tending to 

 Clypeus, Galerites, like Pyrina or Globator, etc., etc., and again Cida- 

 rids akin to C. glandifera and clavigera with Glypticus-like species, 

 and Codiopsis, Coelopleurus, Cyphosoma, and Salenia. 



Among Starfishes the types of Gcniaster and Luidia are likely to 

 prevail, with simple rayed Euryaloid genera, and among Crinoids a 

 variety of genera reminding us of Pentremites, Marsupites, Penta- 

 crinus, Apiocrinus, and Eugeniacrinus. 



The question of the affinities of Millepora will probably receive ad- 

 ditional evidence, and genera connecting more closely the Bugosa and 

 Tabulata with one another, and with (he Acalephs may be expected in 

 the shapes of branching Ileliopores and the like. 



With the monograph of Pourtales upon the deep-sea corals before 

 me, it would be sheer pretence to say anything concerning the prospect 

 of discovering new representatives of this or that type. His * 

 point them out already. 



