KONGL. ÖV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 8. 43 



together and otherwise been disposed as in X. armatum, I should have been inclined to 

 consider it a form of that species, which it inuch resembles in size and shape. 



3. X. fasciculatum Ehrenb. (Infus. tab. 10, lig. 24 b). 



/>' perornatum nov. var. 



Semicellula; tumöre centrali verrucoso verrucis in centro singulis vel binis, margi- 

 nalibus concentrice vel elliptice ordinatis, inter isthmum et tumorem verruca prsedita;. 



A (i ornato Nordst. Desm. Grönl. p. 12, tab. VII, lig. 10 angulis inferioribus semi- 

 céllularum dente granuliformi singulo armatis (ut in ((, Ralfs Brit. Desm. tab. 1'J, fig. 

 4 1)) et verruca ad isthmum proecipue differt. 



Long. sin. acul. 57 ,«; lat. 54 ,"; crass. 32 — 38 ,«. 



Omatangi (240, 244, 246, 248, 266). 



Forma swpernumeraria. Semicellula; spina singula supra tumorem centralem paullo 

 inlra marginein apicalem posita ornatae; a vertice visse medio utrinque spina infra tu- 

 morem medianum. — Tab. 4, fig. 23. 



Long. sin. spin. 54 — 64 ,«; crass. 38—42 ,w; long. spin. ad 8 ,u. 



Taupo'(155); Omatangi (210, 242, 248, 249, 253, 266); Tauranga (305). 



4. X. hastiferum Turner. Som. Desm. (Dec. 1885) p. 938, tab. 15, lig. 20. X. antilo- 



peum (i angulatum Joshua Burm. Desm. (Jan. 1886) p. 643, tab. 24, lig. 16. 



Ii inevohitum nov. var. Tab. 4, fig. 24. 



Semicellula spinis brevioribus intermediis carens. (Meinbrana in centro (supra isth- 

 mum) incrassata fuscescens). 



Altitudo semic. s. acul. 21 ,«; lat. s. acul. 43 /', cuin acul. 55 ,«; long. acul. 15 ,«; 

 crass. 18 ,«. — Tantum una semicellula a me visa est. 



Taupo (157). 



I agree vvith Mr. Turner in concerning his ligure 1. c. and A', antilopceum f. java- 

 nica mihi as forms of the same species, and I think it comes very near to other forms 

 of A', antilopceum, but perhaps at present it may be best to regard it as a distinct species. 



5. X. dilatatum nov. sp. Tab. 4, fig. 25. 



X. parvum tam longum quam latum, profunde constrictum sinu mox ampliato; semi- 

 cellulaj fere i'ectangulares basi paullo convexa>, lateribus levissime retusis, apicem truncatum 

 versus paullulo angustata\ angulis aculeos singulos vel binos parvos gerentibus, medio in 

 centro tuberculo 2 — 3-denticulato et ad apicem tuberculo aculeifero ornata?; e vertice visa; 

 rectangulares angulis aculeis singulis vel binis, medio utrinque tuberculo magno bidenti- 

 culato, infra tuberculum aculeo; a latere obovato-hexagonas, apice lato leviter retusa? me- 

 dio bi-aculeata3, angulis (superioribus) subproductis aculeo ornatis, utrinque medio tuber- 

 culo obtuso. 



Xanthidio Smithii Arch. proximum semicellulife ad apicem versus minus angustatis, 

 tuberculo parvo 1-aculeato apicali et alto centrali praecipue differt. 



