TIIK NAUTILI !S. 



19 



sliinin<5, the more recent whorls perhaps a little more rapidly in- 

 creasing in size than the first three or four, the apex acute with the 

 embryonic whorls two in number and very minute, the next three 

 small and simple, the five succeeding similar to the 

 preceding three except in possessing, at each side, a 

 large obtuse aliform process as shown in the figure. 

 Umbilicus rimate. Inner lip defined throughout by 

 callus, which is slightly reflected along the umbilicus. 

 Surface of all the whorls feebly and evenly convex, 

 the suture fine and simple but distinct. Length 3.0 

 mm. 



Lower Claiborne Eocene (St. Maurice, La.) 

 The outer lip is broken away in the unique type, but undoubtedly 

 possessed an aliform projection similar to that immediately above 

 it. The processes are of the nature of thin varices which served to 

 protect the animal, and the growth of the shell between these tem- 

 porary arrests was probably very rapid. 



THKEE NEW SPECIES OF CHROMODOEIS. 



BY T. U. A. COCKEKELL. 



The species here described are obviously diflferent from G. call' 

 Jomiensis, Bergh, and G. agassizii, Bergh, and I do not find any 

 descriptions applicable to them. 



Chromodoris uNiVEitsiTATis, n. sp. Length about 67 mm., 

 -rather narrow, mantle less ample than in G. mcj arlandi , not ex- 

 panded at the sides ; rhinophores and branchiaj wholly retractile ; 

 rhinophores stout, with numerous transverse lamellae ; branchia; of 

 about 12 large simply pinnate plumes, several more or less branched, 

 ^nd so bipinnate at the ends; oral tentacles just concealed by 

 mantle ; hind end of mantle gibbous ; foot projecting 20 mm. behind 

 *nd of mantle ; breadth of sole when crawling 8^ mm. 



Color rich dark ultramarine blue, the edge of the mantle and the 

 edge of the foot bright cobalt blue ; rhinophores very dark blue ; 

 mantle with two longitudinal series of oblong very bright orange 

 spots, about seven in a series ; five round orange spots on the anterior 

 part of the mantle, in front of the rhinophores ; under surface of 

 posterior lobe of mantle with a series of eight round white spots, the 



