62 HENSHAW : SEMI-FOSSIL SHELLS IN HAMAKUA DISTRICT, HAWAII. 



Sueeinea pristina, n. sp. 



PI. V, figs. 5, 6. 

 ShiiU elongate, moderately thick (in large individuals very thick), lines 

 of growth usually moderately marked (in some large specimens strongly so); 

 spire produced, nearly h.alf the length of shell, apex acute, suture moderate ; 

 whorls 3;V — 4 ; aperture only of moderate size, narrowly ovate, but slightly 

 oblique to axis of shell ; columella moderately curved : peristome simple, 

 acute, thin. 



Long. 17.5, lat. 8 millim. : long, apert. 8 millim. 



Hah. — Mana, Hamakua, Hawaii 



This species differs markedly from the [jrevicnis one, es])ecially in lacking 

 the spreading base, and in the much less oblique aperture lis relations are 

 much closer with the S. protract a, Sykes. It a{)pears, however, to have 

 been much larger than this species, and the shell is much thicker, //rotrarta 

 being one of the most fragile of Hawaiian ^ucci/i/'as. I'ri^tina appears to Ije 

 even more closely related to the -S'. prorera, Gould. 



One individual, considerably the largest of fifteen, measures as follows : 

 Long. 21, lat. II millim.; long, apert. 13 millim. 



The colouration of this species when in life j)r(jbably differed mucli 

 from that o'i protrarta, which is l)rown or horn colour. A single specimen 

 o{ priftina has retained its colour sufficiently to show that the columella and 

 base were of a deep red or maroon like the S. thaanunii, Anc, and the 

 S. Jjirolurafa, Anc. 



Sueeinea gibba, n. sp. 

 PI. v, figs. 7, 8. 

 Shell broadly ovate ; lower whorl large and strongly convex ; lines of 

 growth but slightly defined : spire very short, (jbtuse, mammilliform, of two 

 whorls, less than one-third whole length of shell : suture shallow and narrow ; 

 whorls 3 ; aperture large, broadly ovate ; columella much curved, slightly 

 reflexed posteriorly ; peristome simple, acute. 



Long. 20, lat. T2 millim. ; long, apert. 14 millim. 



Hah, — Mana, Hamakua, Hawaii. 



This species seems to be quite distinct from any of the insular forms. 

 It is chiefly remarkable for its great size and for the very marked convexity 

 of the lower whorl. 



Below is appended a complete list of the semi-fossil shells found in the 

 above mentioned localities. Thorough investigation of the de[;osits and of 

 others in the northern part of Hawaii, will no doubt add other species to 

 the list and also.reveal additional undescribed forms. 



The smaller species have all been identified by Mr. Ancey from material 

 sent him, and the author is greatly indebted to this conchologist for a list 

 of the forms detected by him including the new species. Where Mr. 

 lialdwin or the author are responsible for the identifications, this fact is 

 indicated by the name in brackets. 



