276 BRIGHTWELL, ON TRICERATIUM. 



New Species described by other A^ithors. 



Mr. Shadbolt has described four new species from Port 

 Natal. See ' Trans. Mic. Soc' Vol. II. p. 15. 



1. T. sculptum. ' Trans. Mic. Soc.,' Plate I., fig. 4. — A fine specimen 

 of this siiignlar species has occurred in a gathering received by me from 

 Wairau, New Zealand. 



2. T. arcuatum. L. c, Plate I., fig. 5. — Qu. T. xnleorus, Ehr. ? See 

 ante. 



3. T. orUculatum. L. c, Plate I., fig. 6. — I have detected frustules 

 of what I take to be this species in shell cleanings ; and have seen slides 

 of the same from the Mauritius, marked T. oceUatum ? Ehr. ; but they by 

 no means agree with Ehrenberg's specific character of that species — " late- 

 ribus leviter concavis, cellulis inequalibus mediis maximis hexagonis." 

 Mr. Shadbolt's appears to me a good species, and appropriately named. 

 I have given a front and end view, to afford an opportunity of determin- 

 ing'the species. 



Plate XVII., fig. 20 a, end view ; fig. 20 h, front view. 



4. T. contortum. L. c, Plate I., fig. 7, a, b. — This singular and in- 

 teresting species has some affinity to my T. cmiiferiim, but is quite dis- 

 tinct. 



Professors Harvey and Bailey have described four new 

 species. See ' Mic, Journal,' Vol. III. p. 94. No figures are 

 given. 



1. T. concavum. Hab. Tahiti. 



2. T. (jihbosum. Hab. Tahiti. 



3. T. orientale. Hab. Mindanao. — The description exactly agrees with 

 that of T. grande, in my former Paper. See vol. i., p. 249 ; Plate IV. 

 fig. 8. I conclude they are the same. 



4. T. Wilkesii. Hab. Paget's Sound. 



Professor Bailey has also described and figured another 

 new species. 



T. setigerum. ' Smithsonian Contributions to Knowledge,' Feb. 1854, 

 p. 11, fig. 24. Tamjja Bay, Florida. — This species. Professor Bailey says, 

 appears to be allied to his T. spinosum, and both these species appear to 

 me allied to my T. tridactylum, and to T. armatum, Roper. I incline 

 to think they are all one species, and in that case should be called 

 T. spinosum. 



