", ■*■■ ■ 



' t. 



MANN- — DIATOMS OF THE ALJ5ATR0SS VOYAGES. 273 



This gonus and Iho next, Asloromplialus, form logotlier a gronp sliarply dofmed 

 from Lill othcT disciform diatoms. Tho two genera are c^asily distinguislied from each 

 oth(T by tlie fact that in Astenjiiiplialus one of tlie radiating limba is not symmetri(^al 

 with the rest, bill much narrower, and at its inner extremity, where it goes to make 

 u[) the central rosette of segmentsj iL is gt^nerally not as the rest are, i. e., wedge-shn]M^d 

 and tcTuiinating at tlic center, Inil is (Htlier chib-slia])ed and ex^teiKhni beyond the 

 cenUT or rectangular and not n^acliing the center, or if it liappen to be wedge-shaped 

 it is smaller and Tiarrower than th(^ otlier segnuMits. AlthoTigli this asymmetry of one 

 radiating liml> in AsttTomphabis is v(Ty constant in its many species, it is a rather 

 inad(^quate basis for separating into two genera forms tliat are otherwise so mucli alike 

 ar.d are so different fnnn all other iliatoms. Ibit for convenience of chvssincation ii is 

 certainly advantageous to leave tlicm as they are. The genera Rylandsia Cirev., 

 Truania Pant., Bergonia Brun, Stt'lladiscus Rait., and Asterodiscus Johnst. ar(^ the 

 nearest forms to tlu; two above-named irtmera. 



Asterolampra marylandica l^hrenl). Ber. Akad. Wiss. BcrL 1844: 7G. /. 10. 1845, 



Bail. Amer. Journ. Sci. 48: pi. 4-/. B. 1815. Bright. Quart. Journ. Micr, Sci. 8: 



94. pi. 5 J. J. 18(J0. WalUch, Trans. Micr. Soc. Lond. n. s. 8: 17. pL 2 J. thl5. 



18G0. Ralfs in Britch. Hist. Infu^. ed. 4. S:3G. pi. IJ.f. S3. ISGI. Much. Diat.-taf. 



/;/. :?2.f. 1-4. 1890. Griff. & Ilenf. Micr. Di<L. ed..3. pi 19, f. 5. IS75. Gr(^v. 



Trans. Micr. Soc. Lond. n. s. 8: 108. pi. S. f. 1-4. 18G0; 10:44. pi 7./. 1-S. 



\m2. Ratt, Proc. Rov. Soc. Kdinl). 16: 19']. 1H89. 

 Astemhimpra septenariiis J<)]mfi. Amer. Journ. Sci. II. 13: 33. 1852. 

 Asterolmnpm iwpffr fih^jid]). Trans. Micr. Soc. Lond. n. s. 2: 17. pi 1 . f. 14. 1854. 

 Asterolampra hexadi'^ Ehrenl>, Phys. Abb. Akad, Wiss. Berl. 1872: 392. pi 9.f. 1-2, 



1873. 



Asterolampra pelmjiea YA\Yv\\]). Tbr. Akad. Wiss. BerL 1854: 238.1855?; Pliys. 

 Aldi. Akad. Wiss. Berb 1841: 2:J2. pi O.f. 4, 1S43. 



Found at stations 2807, 202011, 21>2:b rralapa^n)s Ishmds, Hawaiian Inlands, and off 

 southern (California. 



ASTEROMPHALUS Ehrenb. 



Aster omphalus Elirrmi). Bor. Akad. \\*iss. Px-rl. 1844; 198, 200. 1845; Mikrog. 

 plS5A.XXI./.,].lH5i. Rati. Proc. Roy, Sor. Ivbnl). 16: 20(i. 1889. DeToni, 

 Sylb Alg. 2: 1 109. 1894. 



Spatangidhiv} f^r(4). Ibdl. So(\ Linn. Xorm. 2: 294-7. pi S.J. 3. 1857, 



Actinogramma Elirenl). Phys. Al)]i. Akad. Wi^^s. BcrL 1872: 255, 392. pi .9,/. S-6, 

 1873. 



Mesaslerias Ehrtmb. Phys. Abh. Akad. Wiss. PxtI. 1872; 392, pi 9.f. 7. 1873. 

 Asterolampra Ehrenb. in part; Grev. Trans. Micr. Soc. LoikL ik s. 8; 117-119. pL 

 ^./. irj-lS. 18G0. 



The genera neaicst to lliis are tlie same as arc enumerated und(T Asterolampra, 

 wliere also tln^ clos(^ simihirity of tlu*se two gcuf^ra is (Hscusse(L Gn'vilh' misplaced 

 n(*arly all his (examples of this genus in- Asterolampra. 



Asteromphalus arachne (Breb.) Ralfs in Prilch. Hist. Infus. ed. 4. 837. pi .7./. GG. 



1861. Schmidt, Aila^ pi 38. /. 3-4, 187G. Jan. Aldi. Schles. Ges. Vaterl. Cuh.. 



1862-^: 14, p/, 7/1. /. 13, pi '.HI /. IG, 1SG2. Rait. Proc. Rov, Soc. Edinb. 16: 



6G5. 1889. Do Toni, Syll. Alg. 2: 1417. 1894. 

 Spatangidium arachne Breb. Bull. Soc. Linn. Norm. 2: 29G. pi S.f. L 1857. 

 Asterolampra arachne Grev. Trans. Mi( i-. Soc. Lon<l. n. s. 8: 123. 18G0. 

 Astcroniphalus malhus Wal!. Trans. Micr. Soc. Lond. n. s. 8; 17. pi f./. 11. 18G0. 

 Astcyomphaliis inalht/ormisWdli. 4^rans. Micr. Soc. Lond. n. e. 8: pi 2. J. 11. expL 



18G0. 



