78 - MESSES W. WEST AND a. S. WEST ON 



145. Staurastbum tjndtjlatum, nov. sp. (PL VIII. fig. 37.) 'S'. parvum, circiter IJ-plo 

 longius qiiam latum (cum processibus), profunde constrictum ; semicellulse sub- 

 campanulatse, in basi ventricosse, apicibus truncatis et subundulatis, angulis 

 superioribus in processus profunde undulatos productis, apicibus bidenticulatis ; 

 vertice visse triangulares, lateribus concavis et subundulatis, angulis processibus 

 undulatis productis apicibus unidentatis. 



Long. 17 /It ; lat. cum proc. 38 in ; lat. isthm. 5-5 ju. 



No. 18. 



146. Statjrastrum excavatum, nov. sp. (PL VIII. fig. 42.) S. parvum, 3-plo latius 

 quam longuni (cum processibus), profunde constrictum, sinu aperto et obtuso ; 

 semicellulse late campanulatse, apicibus profunde concavis, angulis superioribus in 

 processus longos subpatentes rectos undulatos attenuates productis, apicibus 

 tridenticulatis ; a vertice visse fusiformes, polls in processus leviter curvatos 

 productis ; membrana glabr^. 

 Long. Id /n ; lat. cum proc. 46/* ; lat. sine proc. circ. 12 /t ; lat. isthm. 4*5 /w ; crass. 6 /n. 

 No. 3. 



This species differs from allied forms in its subpatent processes, its large apical 

 excavation, and fusiform vertical view. It is somewhat similar to S, paradosum, Meyen, 

 var. longipes^ W. B. Turn. (Preshw. Alg. of E. India, p. 125, tab. xv. fig. 4 c, non a-b, d-e), 

 non Nordst. (Sydlig. Norges Desm. p. 35, fig. 17). 



147. Staurasteum exile, nov. sp, (PL VIII. fig. 38.) S. parvum, psene duplo longius 

 quam latum (sine processibus), profunde constrictum; semicellulse campanulatae, 

 apicibus minute biundulatis, angulis superioribus in processus parallelos 3-undulatos 

 (non-granulatos) productis, apicibus subemarginatis ; a vertice visae triangulares, 

 lateribus leve biundulatis, angulis in processus 3-undulatos productis ; membrana 

 glabra. 



Long. 13*5 IX ; lat. cum proc. 23 n ; lat. isthm. 3 /u. 

 No. 3. 



Compare with S. paradoxum, Meyen, var. depressum, W. B. Turn. (Preshw. Alg. 

 of E. India, p. 125, tab. xv. fig. 5). 



148. Staurastrltm texuissimum, nov. sp. (PL VIII. fig. 43.) *S'. parvum, circiter tarn 

 longum quam latum (sine processibus), profunde constrictum ; semicellulee obsemi- 

 circulares, apicibus subconcavis, angulis superioribus in processus longos tenuissimos 

 curvatos divergentes et levissime undulatos productis, apicibus minute triden- 

 ticulatis ; a vertice visae triangulares, lateribus subrectis, angulis in processus^ 

 tenuissimos productis, apicibus tridenticulatis ; membrana glabra. 



Long, sine proc. 10 /t ; lat. sine proc. 95 ju, cum proc. 32 /u ; lat. isthm. 3 /i. 

 No. 0. 



