Nos. 620-621] THE HAWAIIAN CORAL REEFS 



4X1 



abundant molluscs on the Hawaiian reefs and aggregate 

 several hundred species. Space forbids any detailed 

 treatment of this huge and highly diversified class. A 

 bare enumeration of important and common families and 

 genera, adapted from Bryan, will indicate the richness of 

 the marine univalve fauna (the number of species is in 

 each instance an approximation) : 



ntons; Tntomdas 12 Triton, Bant 



liny Rock Shells; MuricidBB .. 30 Purpura, El 



Mitre Shells; Mitridse 26 Mitra, Imbn 



Margin Shells; Marginellida? ... 4 Erato, Mara, 



ShHls; 



Shells; Cyprroidaj 40 Cyprcsa, Trivi 



Moon Shells; Naticidse 10 Natica. 



Slipper Shells; Calypraidje .... 12 Crepidula, Crucibulum, Hipponyx. 



Eulimas; Eulimidae 17 Eulima. 



Pyramid Shells; Pyraniidellidae . 3 PyramideUa. 



Sun-dial Shells; Solariidse 6 Solarium. 



Violet Snails; Ianthinidaa 3 Ianthina. 



Ladder Shells; Scalariidae 10 Scalaria. 



Herald 's-horn Shells; Cerithiidae 20 Cerithium. 



Periwinkles; Littorinidse 3 Littorina, Modulus, Risella. 



Sea-Snails; Neritidse 10 Nerita, Neritina. 



Top -Shells; Troehida; ........ 12 Trocliu^ 



Limpets; Fissurellidse and Patel- Helcioniscus. 



Hda? 10 



Sea Slugs; Nudibranchiata .... 10 Aplysia. 



The highest and most highly specialized class of mol- 

 luscs, the Cephalopods, have an abundant and familiar 

 representative on our reefs, in the form of the common 

 octopus or lie'e. This is popularly called " squid" 

 although it is a true cuttlefish, with a small round sac-like 

 body and eight arms. It is very common in holes and 



