

p 





410 entire Intelligence. 



ined a vast Dumber of specimens in almost every variety of pres- 

 ervation, with the very purpose of determining the question of 

 its existence, and I am satisfied that the cornea never existed 

 save as discrete, hollow corneal lenses, for however tenuous an 

 additional continuous layer may have been it would not have 

 been so delicate as to have escaped preservation in some of the 

 conditions observed. Again, it must not be overlooked that in 

 the compound eye of Phacops are continuous patches of scleral 

 integument between the ommatidia, a fact which finds no homol- 

 ogy among recent Arthropod eyes nor in the holochroal trilobites. 

 The eyelets are absolutely and widely discrete, while in Serolis, 

 Limulus they are in the closest apposition. More evidence- 

 needed to prove that the schizachroal type of compound eye is still 

 extant. An interesting suggestion bearing upon its genesis^ and 

 one which may fruitfully be followed up, is that (as remarked in 

 a foot-note to my paper referred to) an extremely young indi- 

 vidual of Calymene (holochroal) showed remarkably large cor- 

 neal lenses and an interlensar sclera developed to such a degree 

 as I have never observed among mature holochroal eyes. 



j. m. c. 



5. Prodromus FaumB Mediterranean sive Descriptio Anima- 

 lium Maria Mediterranei Incolarum, etc., concessit J. V. Caeus, 

 vol. ii, Pars I, Beachiostomata, Mollusc a. Stuttgart, 161 

 [E. Schweizerbartsche Verlagshandlung, E. Koch.] — This first 

 part of the second volume of Dr. Carus's work on the Mediter- 

 ranean Fauna extends to the close of p. 272. The Brachiostomata 

 include Class 1, containing the Bryozoa, which occupy 54 pages, 

 and Class 2, the Brachiopoda, covering 7 pa^es. The Brachi- 

 opoda include 3 species of Terebratula, 2 of Terebratulina, 2 of 

 Waldheimia, 1 of Megerlia, 2 of Platydia, 3 of Argiope, 5 of 

 Cistella, 1 of Thecidea, 1 of Rhynchonella, and 3 of Crania. After 

 these, descriptions of the Mollusca follow, commencing with the 

 Pelecypoda or Lamellibranchia* 



6. Corals and Coral Islands ; by J. D. Da>a. 3d edition. 

 New York : Dodd, Mead & Co. — This new edition of the Corals 

 and Coral Islands, announced on page 326, has now been pub- 

 lished. The map of the Louisiade Archipelago will be found to 

 be a very complete argument in favor of the Darwinian theory of 

 subsidence. The size of the barrier reef — 150 miles long — the 

 great interior sea, and the fragment-like deeply indented islands 

 and islets within, appear to admit of no other explanation. In 

 the discussion of opposing arguments, Dr. Guppy's current 

 theory is shown to be inapplicable to the largest of coral island 

 archipe because the needed currents do not exist. A map 

 of part of southern Oahu, showing the positions of the artesian 

 borings and the accompanying descriptions give the basis now 

 available for conclusions with regard to the origin of the great 

 thickness of the shore reefs. The great coral-reef sand-accumu- 

 lations of Florida, the Bahamas and the Bermudas, reaching a 

 height of 230 feet in the latter region, which all recent observers 



