labro tenui ; labio candido, Isevi ; operculo flavido. Long. .1 

 poll.; lat. .13 poll. 



FissuRELLA ELONGATA. F. t. cloDgata, tonui, diaphana, fusca, 

 albido-maculata, costulis 20 radiantibus, totidem brevioribus al- 

 ternatim dispositis, et 40 brevissimis marginalibus ornata ; incre- 

 menti striis maximis ; anterius concava ; posterius convexa ; 

 intus coerulescente ; fissura atro-marginata, media utrumque 

 sinuata. Lon. .375 poll. ; lat. .2 poll. ; alt. .11 poll. Dec. ant. : 

 Dec. post. : : 1 : 2. 



Patella tenera. P. t. tenui, fragili, diaphana, albida, fusco- 

 radiata, (radiis pleriimque 8) maculata, vel reticulata, exile 

 decussata, anterius et posterius convexa ; margine acuto, exile 

 pectinato. Long. .72 poll.; lat. .53 poll.; alt. .15 poll.; alt. 

 exemp. long. .74 poll. ; lat. .55 poll. ; alt. .21 poll. ; dec. ant. : 

 dec. post. : : 5 : 8. 



Patella albicosta. P. t. crassa, atro-fusca, costulis 12 ele- 

 vatis, totidem brevioribus, omnibus albis — instructa ; margine 

 pectinato, juniorum fusco — et albo-maculato, seniorum albo. 

 Long. .84 poll. ; lat. .7 poll. ; alt. .41 poll. ; dec. ant. : dec. 

 post. : : 4 : 5. 



Chiton squalidus. C. t. albida, atro-maculata, maculis max- 

 imis, rugosa ; areis a costa robusta discretis ; valvis extremis 

 costis 8 ad 10 mstructis ; margine membranaceo, setosa. Long. 

 1.15 poll.; lat. .7 poll. 



Chiton costatiis. C. t. albido atroque maculata ; areis later- 

 alibus elevatis, costulis 3 vel 4 papillosis instructis, posterius sub- 

 spinosis ; areis dorsi mediis loevibus, transversim striatis ; inter 

 areas declivitas est, profunde striata ; margine squamoso, alter- 

 natim flavido-albo atroque. Long. 1.35 poll. ; lat. .75 poll. 



Chiton squamulostjs. C. t. olivacea, linea pallide virente 

 dorsali — ornata ; areis lateral ibus squamosis inequalibus prostra- 

 tis — obtectis ; areis dorsi mediis sublaevibus, puncto-striatis ; 

 margine exile squamuloso, alternatim cinereo-virescente viridi- 

 que. Long. .7 poll. ; lat. .4 poll. 



Chiton multicostatus. C. t. prcelonga, intus rubella, extus 

 pallide virente, punctis albis et atro-virentibus, lineaque dorsali 

 pallida ornata ; areis lateralibus perelevatis, costatis, costis 6 ad 

 8 nodosis ; areis dorsi costulis 20 gracilibus, compressis, — in- 

 structis ; margine squamoso, alternatim virente alboquc. Long. 

 .9 poll. ; lat. 42 poll. 



