APPENDIX. 



Since .the foregoing Eeport passed through the press a few additional species which 

 had previously been overlooked have been transmitted to me for examination. They are 

 all from great depths in the North Pacific Ocean, and, as might be expected, appear to be 

 new to science. They do not, however, present any very remarkable features, but it is 

 very interesting to note that four of the five species are represented in the Atlantic by 

 forms which are all but identical. 



NecBra murrayi, n. sp. 



Testa elongata, gracilis, postice rostrata, insequivalvis, alba, tenuis, liris conccntricis 

 tenuibus subdistantibus postice ad carinam obliquam filiformem obsoletis iustructa. 

 Margo dorsi anticus leviter arcuatus, vix declivis, posticus elongatior, oblique concavus. 

 Margo inferior in medio parum excurvus, infra rostrum baud profunde sinuatus. 

 Rostrum angustum, ad extremitatem curvatum, supra carinam incrementi lineis striatum 

 lirisque paucis radiantibus inconspicuis ornatum. Cardo edentulus. Ligamentum 

 parvum, postice inclinatum. 



This is a very slender species, of thin texture, narrowly rostrate behind, and inequi- 

 valve, the right valve being a little smaller than the left. It is white, with a dull 

 surface, and sculptured with very slender thread-like lirse which are 

 further apart upon the central portion of the valves than towards the 

 lower margin, and become obsolete or mere strise at the oblique keel, 

 which bisects the rostrate end. The rostrum itself is rather slender, ^y^^o murmyi, n. sp. 

 slightly up-turned, curved at the extremity, and sculptured with fine 

 lines of growth and a few very feeble radiating raised lines above the obhque keel. The 

 umbones are small, slightly in front of the centre, and posteriorly inclined. The 

 hinge is altogether toothless, and the ligament is small and directed obliquely towards 

 the hinder side. The interior of the valves is glossy, and, owing to their thinness, 

 exhibits the external sculpture. 



Length 6 mm., height 2^, diameter 2. 



Habitat.— Station 244, Mid North Pacific Ocean, in 2900 fathoms. 



